I've had the Mongoose for about 9 months now and before that a Silverback Alpine. The Mongoose was a nice step up. Love those SRAM's. BUT I'm now at the stage where I'd like to improve my racing times and spend less every month on crappy \ cheap part maintenance. My LBS suggested I buy the Silverback Sierra. They'll sell it to me for R11 500. (The girlfriend wants me to get the Michigan, since it is prettier, but that's over R15 000 and baby's schoolfees is already spent!) Even the Sierra is a lot of money. But if it is going to cut back on my maintenance costs and racing time, I might consider it. Anyone out there that are willing to share some of their expert advice?