I've purchased and used both their MTB shorts and their road cycling shorts as well as several of their basic jerseys. I find all of them comfortable; however, the MTB shorts are a little less useful on a road bike since the baggy legs can get caught in the seat. If your bike has a more upright riding position either is fine and even on the road bike I will still wear baggy MTB style shorts, I just need to be aware that they will occasionally "catch".
I have been very happy with all of the items, both in terms of performance, quality, and value.
If money is really an object, just use regular shirts, jerseys really don't provide much value; as opposed to shorts which really do improve comfort. All the jerseys offer is the convenient (but not necessary) back pockets.