NOTHING BEATS THE REAL THING
Well, the real thing is the C64 itself. There has to be quite a bit of emulation going on in the C-One in those programmable logic chips (emulation in hardware is still emulation).
Besides, turning those portable game joysticks into full-blown C64's is cool. Buying a huge ATX board and putting it in a full-sized PC case is rather silly to me.
None of the software emulators are 100% accurate.
That's because of the reverse engineering and lack of documentation, not the emulator itself. I fail to see how building a new hardware platform based on an old platform differs from emulating an old platform in software.
It's worth noting that the Playstation2 actually has an original, hardware-based Playstation core built into it, and it still has compatibility issues with some PSX games. I still have a lot more fun running my PSX games on ePSXe in 32-bit color, super high resolutions, with antialiasing, and a keyboard, rather than use the crappy, original core built into my PS2.
Like for example good old scroll games, they just dont run as smooth on a pc as on the real thing with custom chipset.
Do you have VSync on? WinUAE runs perfectly smooth on my computer -- far better than any modern PC game, where they always turn VSync off to get better benchmarks.
It's also arguable that the host OS is causing the timing hickups. With a real OS in place, instead of Windows, I doubt there would be so many problems.