I know the integy's for the maxx (MSR4's) are pretty weak. Bomber has trashed 2 of his, one is completely toast. It was ripped in two pieces. The other had the shaft rip out of the shock body.
On the savage, I just did the new era upper arm and UE supermaxx shocks (4) combo. It came out to about $140 upgrade, but if they hold up as well as the ones on my maxx, they are worth every penny.
I was getting about 7-8 feet of air with it yesterday with hard flat landings (crappy place to play) and they held up great. Nice plush feel with 60weight oil. I run the same shocks on my hopped up sport maxx and really like the results. I ramp that thing all day long at top speed about 6 feet in the air. It's just so fun it's almost adicting! I've had the shocks on the little maxx for about 5 gallons worth of running. I just installed the set on the savage thursday, drove it yesterday for about an hour. So, I don't know how long they will hold up. But, I did have the ones on my little maxx on a 14lb 21 maxx for about 3 gallons of their 5 gallon life.