The only true change I have done has been the shifter and handlebar: gears are moved with an 8-speed Shimano Alivio and the front is steered with a wider (29") low rise mountain bike handlebar. I still continue to be impressed with the versatility and tire choice I have with this frame, and so far, no cracks or busted welds.
I am considering racing the Surf City Classic Cyclocross series in October, so the training may begin changing as well as a weight loss program. I have toyed with the idea of going 2X8 on this bike, but I really like the simplicity of the 8-speed, so I will probably leave as-is. A 1X set-up is very nice for racing, as well. I may switch to a 36T front chainring, but I have to see how my training goes.
Advise: get a C'Mute if you're in the market for such a bike. Frames are going for $220-$250 which, I believe, is an awesome value.