Interesting enouth, I had a Crescendo. And I just got myself a Velocity for Christmas. Here's my opinion on the Velocity so far.
Balance - The brush was designed to sit into your hand. It's a longer brush in the back. I suspect that was to improve balance when you fill the gravity cup. And it's tapered at the point where the brush meets the crook in between your thumb and forefinger. I can't think of a better balanced brush. It feels very very solid.
Spray - Great atomization. You can drop incredibly thin layers on a surface. However, as with most .20mm, you have to thin your paint well otherwise it will clog the nozzle. If you're lazy in thinning, then you should consider the Iwata with the .35mm. Either that or swap out the Velocity parts and insert the .33mm needle and parts from the other Badger Renegade. Anyways, a lot of people think that this may be one of the best at atomization. In other words, they layers of paint that you put on a model is so thin that you can still see all the rivets.
Cleaning - Very simple. You basically spray thinner through until clear, then unscrew the back, take the needle out and wipe clean before reinserting and screwing the back back on. You do not soak the brush. You do not take the brush apart. Very much like the Iwatas.
Details - You can work with 1/72 scale up to 1/48 scale. Frankly any of the .20mm detail brush is more than enough for scale model work. In other words, you can free hand any camouflage. It does literally do hairline if you need it.
Trigger - It's a high trigger, with a great and smooth pull. Mine wasn't as smooth on the push to release air. So I turned the trigger around (it's symmetrical) and now the push is very smooth.
Problems - It's an ugly brush. It's not chromed nor colored. The thing looks like a machine part. The nozzle cap and gravity cup cap are both plastic. At least I lucked out and got a special edition black. It is uggglllly.
Conclusion - The Badger Renegade series put all their money into improving the spraying and almost no money into making it shiny and pretty. Parts that has no effect on a coat of paint got treated badly (cap, nozzle cap and non-chrome). Parts that has great effect on a coat of paint got a ton of attention (needle, trigger, balance).