If you're looking for a good expandable, all of the above mentioned work great.
1. Spitfire's
2. Grim Reapers
3. Ulmer Edge
4. Wasp J Hammers
I've had similar experiences with the rocket expandables, blades bending beyond usability after only a couple of shots into a target. Which isn't a terrible thing as sometimes a little give in the blade is better than being brittle enough to snap, specifically on bone hits.
Although if they aren't completely dead set on using a mechanical broadhead, take a serious look at the
Smoke Ramcats. I switched to them this this year, and they have a larger than average cutting diameter for most fixed blade heads. Are sharpened on the back side, so if you don't get a passthrough, they will
expand AND
cut on the way back out. Also, they fly absolutely incredible! Shot them out to 70 yards and didn't have to move the sight, rest, or anything. Just straight up flew like the field points, and I didn't spend a ton of time tuning my bow to begin with. Killed two deer with them this year, and they did great. These things penetrate like you wouldn't believe (not that it's a huge deal on whitetails anyway), but it's a little confidence booster. There are also some pretty good youtube videos online where they tested penetration against all the other leading broadheads at the ATA show and out penetrated them all.