Are the analog readings a problem? Most electronics don't even try to get smooth analog voltages, so it appears to be a non-issue. Controllers with analog smoothing are Gen7 and STB, IIRC. Teacup firmare also features mathematical smoothing.
One issue with USB is, the connection occasionally stalls, apparently due to GND differences. Happens for me something like once a week.
One issue with USB is, the connection occasionally stalls, apparently due to GND differences. Happens for me something like once a week.