New barrel, feedneck, drop forward/rail/unimount, reg (although stock is decent)
Light, smooth firing, little kick, fast, low profile
Trigger is kinda sloppy, non-field strippable, 17 bps cap
I doubted the Ion when I first heard about it, but I recently bought one and to my surprise, it performed better out of the box than my Rat Impulse ever did. The Ion is very light (comparable to an 03-05 Shocker), shoots very smoothly, has a decent stock reg, is low profile, and it runs at low pressure. For 285 bucks, you couldn't ask for more. I don't think it's even worth buying a 500-1500 dollar gun when you can get this and upgrade a few parts to make it compete with the higher end guns. I'd recommend slapping a new barrel, unimount, and adjustable feedneck on the gun and that's about it. Maybe a new reg or grips if you want. The only real complaint is the 17 bps cap and the sloppy trigger, which can be adjusted to your liking. I set my Ion on rebound mode and DAMN! It's fast! Overall, it was a great purchase.
I'd definitely recommend this gun to any new player looking for a gun to compete with the best or anyone who plays regularly. For the price, it's unbeatable!
When you say that a weaknesses is the 17bps cap, I doubt that is really affects you. I doubt you can shoot that fast, and that's all most markers really need. When Dynasty first started out, they used Revy's, and the reason was that they were realistic, they knew they wouldn't be shooting more than the Revy capped in real games, (and plus the Halo B wasn't out then) Be realistic, that doesn't affect you at all.