Price, I bought mine used but they are quite cheap these days.
Capacity, at 220 rounds it can carry enough balls to get me through a couple games and that's all I ask.
Looks, even being as large as it is it doesn't present that big of a profile from the front and it looks very nice to my tastes.
Tilt sensor, I like this. Even when I was leaning my marker almost sideways with only a couple balls left it managed to scoop those balls up and feed them regardless which way I leaned. Small thing but it does work well.
Screen, I personnally think every electronic marker should have a screen so having one on my hopper too is nice. Not something I use often but if you like keeping track of time/shots etc it's handy. It really comes in use for settings such as whether you're using an open or closed bolt marker, motor speed, duration, sensitivity, etc.
Weakness: Shell. Doesn't feel anywhere near as thick as my HaloB. My Backman was used and has a couple cracks but still hold together, and a friend who has the same hopper needs a new shell. Not too bad but maybe more fragile than others.
All in all I think it's a great hopper. It's obviously not as fast as a force fed hopper like a HaloB or Vlocity but it's also less than half the price. It'll keep up in semi fine unless you have some pretty quick fingers.
I'm going to give it a 9 as a thicker shell would be nice. I think it's the best in it's price range though.