I don't own a Sirius, but I'm familiar enough to give you my take. Grab your vape and kick back... i can ramble some. First, I have a Modefined Prism 250w three battery mod, their first release. The Sirius is their second Mod and the Lyra is their latest and the first to be offered as a kit or mod. This is Lost Vape's new sister company. Zero issues with my Prism and I just reached 5,000 puffs earlier this week. Got mine in November, within a week of my first Triade arriving. I can barely tell the difference in overall vape experience between the two except for the Prism already having the 3rd button. Not able to do the DJLsB type tests for accuracy, but I think they are within 2 watts of each other when I vape 115 with a Valyrian on each, side by side.
The Sirius owners I've seen reports from are very happy with their purchases and I can understand why. Build quality is great and the Sirius' chip is an improved version of the Prism's. It did need one firmware patch between first
reviews and final product, just as the Lyra might have gotten between beta version and current retail. Lyra is an all Ultem mod which I think is cool. The Sirius is on sale at Volcanoecigs for $29.99. Best price I've seen thus far and given you asked this question near 3 weeks ago... you likely have gotten something by now. I would suggest if you don't own a Sirius, at this price, add one to your collection or get a Prism and truly understand how much of Lost Vape has been put into these devices. Never hurts to have an extra workhorse nearby.
I personally didn't need a new 2 battery mod this winter and skipped the sirius to wait for the 3rd release. I'm glad I did, but it's really just a personal taste call. With Modefined's mods priced around $50 they have set their sights on a segment of the market filled with schlock that ignorant shop owners shouldn't be recommending so strongly... if they only knew about more than Smok products.
My buddy just tried 6 mods at my house last months. 1 tank. 1 juice. 6 mods. I wanted his first impressions as a guy just moving from closed pod systems to real gear. He could immediately tell the superior vape offered by the DNA chip, the Drag's Gene chip and Modefined Prism compared to Geekvape's Aegis, an Innokin and Smok's Tpriv. After that test, I was better able to select his first mod based on size and performance... I got him a 75c Finder since he only Vapes around 25-40w.
Take a look at
vaping with Vic and DJLsB's reviews on the Sirius. I think they will speak best. Volcano's price is stellar and likely a sign of the fast paced market. I don't know production volumes on these, but the Lyra is near impossible to find with any of the silver combo finishes and the Prism' s price has barely fluctuated since it came put last summer (really happy with mine and it has never needed a firmware patch). Hope this helped. Best, Phil