The Jekyll 400 came with a Terry Butterfly. I have to admit that I love it - no problems on long (for a MTB) rides. I have a Fizik Vitesse on my R1000, and same on an R1000 that I had to return (new one coming in any day now!) The first one was comfortable immediately - did about 150 over three days the day after I bought it, so no break-in was needed. On the one I returned, it was awful, but I think that the whole bike fit was off, since it's the exact same model as my other one.
yikes. long answer. The Terry Butterfly and Fizik work for me, but everyone is different!