Well I've had a stock white DC for a few years but admittedly haven't given it nearly enough love. But recently I finally bought this SEGA Sports DC from my work (I repair game consoles). It had come in with a half-assed GD-Emu install, no heatsinks, no supports, improperly formatted sd card full of bad cdi rips, etc.
I tore it down, recapped the main board, did the standard controller port PCB upgrade, cleaned everything, made some nice supports for the GD-Emu using machine screws and threaded brass standoffs, also had our fabrication guy make a nice custom bracket to hold some N64 heatsinks on the chips. Now the GD-Emu sits nice and rock solid and the system runs nice and cool.
I got my Toro box in yesterday, so I've been having a real blast playing with this thing on my RGB modified CRTs. I also have a Brook Wingman adapter coming in tomorrow!