Gotta disagree, differences are big in my eyes.
V1 has a much better finish (polished version),a better lock ring design and the unique looking switch which is great to use (V2 is uncomfortable to press when your finger is not exactly in the good orientation).
Also I got unlucky with QA on mine: I get battery rattle on a 18350 even when pushing at max, the lock mechanism is so tight that I need to fight it every time I need to remove the telescopic tube.
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The tube lock ring/mechanism is tighter to begin with but it is a much better design then before, bigger, holds better, doesn't deform and conducts better. The tolerances are tighter on it, but if you give it time, trust me it will break in and slide with relative ease.
As far as the battery rattle: First, double check that the oring is in the bottom of the battery tube, it is necessary, some remove it, but this is a shorting hazard without it. If you have an adjustable center pin in your rba/rda, extend it out further, then back of the ELA center post so that you can tighten the atomizer all the way down tight against the ELA cap, then adjust the center post back up to contact the atomizer.
As far as the finish, it's kind of a damned if you do, damned if you don't. Some always wanted a shinier finish, some like the more brushed look. I can tell you this though regarding the finish, we have a lifetime refinish warranty, so if you don't like the shinier, eventually your unit is going to need a freshen up, so send it in and we'll finish it to what you like

It's a win-win.
As far as the button, again, its another damned if you do, damned if you don't. One big complaint of the old style was it wouldn't standup. Moving the horn flush allowed us to accomplish standing up. To ease the button use, I recommend a regular strength spring (some where shipped with HD) and adjusting the throw as short as possible. This will greatly improve your button feel. The larger button lock though does make it easier to lock too.
I will say, I'm not a big fan of the knurling either, I think I like the older style too. But a little change up is good here and there. I can make some of the old style too again.