Had a few issues with them that finally caused me to give up, as well. When the SAM 440ep's came out, the i/o backplates were not yet done. When they were released, vendors were sent them from ACube for the purchasers of said SAM mobo's. I tried 4-5 times via AmigaKit's support system to obtain said item I bought and paid for and never managed to get a reply once, sadly. I'm looking at getting an accel and flickerfixer for my 1200, as well as considering a SAM 460, and I'll likely deal with someone else due to these experiences.
Shame, had super luck with them on the SAM sale initially.