Have no fear of the PF30 BB. If treated correctly is will stand up to miles of service if you follow a few tips...
I would assume SRAM?
If so, you want to remove the seals when new and pack the bearings full of good quality waterproof grease. The BB's come from the factory with very little grease and this becomes an issue with water. More grease equals less room for water to sit and contaminate the bearings. This works pretty good and I have done two seasons of Cyclocross with multiple washings and go through a BB per season at this point.
There are also some aftermarket units that will see the fear of the PFBB 30 be a thing of the past. Chris King has entered the market by showing a unit at Euro Bike, as well as Enduro bearing company having one for the last year. Two great choices.
To me the RSL is worth the stiffness and weight savings....and yes I'm biased....I've ridden pretty much everything we have made over the past 15 years and find the MX RSL to be a total rocket. The correct tires and tire pressure and it is a pure joy to ride/race.
I wouldn't be afraid of the BB...it's noticeably stiffer.
Let me know if you have any other questions.