I bought two new Fender Am Dlx basses in the last two years, (a P, and a J),which have compound radius necks. If I had not read about the compound radius feature before playing these, I would not have recognized that the design is different than my other basses. So to me, the effect is subtle. I have read that one effect of the compound radius is to allow bending of notes without fret buzzing. This would be more evident on a guitar, than a bass for the way I play. I will say, that these basses play really nice, so maybe the compound radius design contributes to the overall feel. The action can be set very low, as well. I don't know if the design contributes to that, or not. Don't expect it to make a big difference in the way a bass plays. But do expect it to contribute to the overall feel of the instrument. There are a lot of great basses out there that do not have a compound radius finger board design. If I was buying another new Fender, I would consider it to be a desirable feature, but not a deal breaker for an instrument with a lot of other things going for it. So, to answer one of your questions, yes, my two basses with compound radius necks are very comfortable to play. Is it because of the compound radius? I don't know if I can confirm that from my experience.