Good for you! The MVP2.0 has a 2600mah battery in that while the smaller ITaste vv/vw V3 brother is 800mah. The full charge should last much longer then that as well as outlast the latest 1500-1600 variable batteries. What I will miss about the Groove II before getting the VTR was the slighter larger size and yet didn't really weigh that much more then MVP itself. The VTR is a zinc alloy and has the weight making it a bit awkward for some over the MVP and it's smaller size while the button is placed like the trigger found on some of those grip mods.
The one thing that does seem to urk some people with the MVP is how you find a shoulder around the button itself likely designed to keep it from accidental depression while carried around. The Groove II had a larger button on top much like what is seen on a vamo. But the casing was plastic and not as study build as the Innokin products. I noticed with the V3s they used rivets while none are present on any eGo batteres! Had the connector pulled on one of those when carried arond with a clearomizer attached. I put tanks, cartimizers, clearomizers, etc. on the MVP without worry!