I don't care who makes it or what bells and whistles it has. 2.5A limit is a deal-breaker for me, just as it was on the first generation ProVari. Worst implementation (for my purposes) is the original LavaTube, with its automatic (stealth) reduction in voltage whenever 2.5A is exceeded. Next worst is either shut-down or error-code refusal to fire in excess of 2.5A.
For lots of people, a 2.5A limit will be fine. Those who use standard or higher resistance atties/cartos will have no problem, and for them, the current units---LavaTube, Vision TOX, whatever---are a relatively low-cost solution to a metal tube VV with a voltage display and precise incremental adjustment of voltage.
My preferred atomizing devices, however, are 1.5-1.6 ohm dual-coil cartos or 1.7 ohm Resurrectors, either alone or inside tanks. With those, 2.5 amps at 1.6 ohms tops out at 4.0V, and 1.5 ohms tops out at 3.8V. For me personally, those relatively low max voltages defeat the whole purpose of higher voltage VVs, whether boost or buck. Heck, I might as well use eGo batts.
Yeah, I could use 2.0 ohm or even 2.5 ohm DCs, but I already have an inventory of about 70 low-resistance DCs and Resurrectors, and I like them, so I would be less than thrilled to have to buy another stash of higher-resistance cartos.
I run my 1.5/1.6 ohm dual coils at 4.5V (sweet spot), and even sometimes at 5V (warmer vape). All of my eight Madvapes VV boxes, my Buzz Pro, and most of my various 5V-regulated mods pull that off without breaking a sweat. Ohm's Law translation at 4.5V through 1.5 ohms is 3.0A current and 13.5W power. Whether or not that is "too much to expect" is irrelevant to me---it's simply my minimum requirement if I'm going to throw money at at any more VVs.
I read speculation that next-generation LavaTubes and clones may increase the limit to 3.5A, just as the ProVari did. If and when that occurs, I might buy one. Until then, not a chance.