@SacredNut - congrats on your new purchase, and especially the anniversary!
The M80 is a fine variable-wattage mod, giving you plenty of watts to play with for experimentation. Battery life is good too, and there's up to 2A charging so it's fast to charge. If they had released it without the TC feature at all, it would be more highly regarded than it is - it does the job fine, they just let things down a bit by lying about the fake-TC.
But if you didn't buy it for that, you'll do absolutely fine.
The VTR is quite a while before my time, but from what I can see I'd say it's one of the earlier, old-generation VW/VV mods. Tech has moved on a lot since then, so the M80 should be an upgrade in every respect.
High pitched noise: That's called Pulse Width Modulation. It's a method of firing DC electricity at a coil. I can't pretend to really understand the technical details, but it's not uncommon in mods. It works fine, just it has that sound that you noticed. Many people can't notice it - myself included (which now makes me a bit worried about my hearing!) It's not going to go away with future upgrades, it's just the nature of the way they chose to send power to the coil. But it's also nothing to worry about, so long as it doesn't bother you too much. If you google /search this forum for Pulse Width Modulation or PWM you'll find plenty more discussion - and pbusardo has mentioned and discussed it in a number of his videos. Perhaps one of his earlier ones will have a fuller description.
It's also referred to as the "rattlesnake sound", because it can sound like, well, a rattlesnake! Like a fluctuating hiss. I'm not sure if it always sounds like that or just sometimes.
Ohms: Yeah having a two-digit ohms reader is a great advance, that was one of the reasons I got my M80 as my second mod, after the iStick 50W. Ohms readings from mods are known to vary quite a bit. In this case, I would take your M80 to be accurate. It's much newer, and it reads with greater granularity. I found something similar when I compared my iSTick to my M80 - the M80 might read 0.51, the iStick would read 0.7. Usually the iStick was higher (by more than 0.1) but I think once or twice it was lower. You can never be sure how the mod is calculating and displaying that figure. As an example, the recent IPV4 and Yihi SX Mini M mods, both using recent Yihi chips, have a feature called Set Resistance which is used for (proper) TC. This displays the ohms to three decimal places. But the rest of the time the mod only displays two. What's then noticeable is that the two digit display is not a rounding of the three digit version, but a truncation. In other words, if Set Resistance shows 1.219, the main mod display will show 1.21 - it just cuts off the last digit. It's probably still using that third digit internally, but the display only shows two decimal places and for some reason they decided to truncate, not round.
I use that as an example of how the displays are not necessarily that logical in what they display. Perhaps when the M80 shows resistance as 0.51 and the VTR as 0.7, the VTR has calculated at 0.61 and then has an "always round up" rule .
Anyway the main point is, don't worry. Now that you have the M80 and it shows two decimals, I would use that as your reference point.
And a difference of 0.1 or even 0.2 is not going to make any noticeable difference in your vape. It matters for TC, but not normal wattage/power mode. At least one of the mods must be wrong, or they both might be, but they'll both vape fine. Problems with ohms come when the readings are many tens out, or if the reading keeps fluctuating - indicative of a loose connection somewhere within mod, atty or coil.
If you want to "break the tie", invest in a decent quality ohms reader. Actually they're all much of a muchness - mostly all $10 - $15, none with super guaranteed accuracy. Just be sure you get one that has a 510 connection in it for the ohms reading. I made that mistake - I got an EFest one that seemed popular (on loads of websites), but didn't look closely. When I got it home, I realised it had 2 x ego connections and a metal adapter to turn Ego to 510 for the ohms. That was total crap - when I screwed the adapter on to the ohms reader, then the atty onto the adapter, half the time trying to unscrew the atty took the adapter with it. So I tightened the adapter super hard. But then I got ohms readings that were all over the place - reading 1.5 when I knew the resistance was 0.5, stuff like that.
An ohms reader is definitely a useful thing to have: to get another reading of ohms if your mods disagree (and many use it as their standard reference point), and as a flat base on which to build attys/coils (and on which it doesn't matter too much if juice leaks.)
There's half a dozen or more on FastTech alone, and some have reviews confirming their accuracy - just check it has a built in 510 and you'll be fine. (In my case, I purchased a cheap spring-loaded 510 connection and have the ohms reader on my lengthy 'to do' project list, planning to take it apart and solder in the better 510 connection.)
Hope that helps - and hope you really enjoy the new mod!
