The latest batch of CycloDS (black version) is an improved version compared to the white in terms of reliability so the defect problem is pretty much fixed. The only issue is the possibility that your microSD card might not fit properly in the slot, could stick out a millimetre or two
If you can do without some of the features CyloDS has, though it would be a step back with software and whatnot and don't want to spend as much money, then go for an R4. I can't really provide much opinion on the R4 since I have the Cyclo myself