I've seen those kits before but have no experience with them. I know technically there are reasons that ceramics are discouraged in the signal path (DC bias affecting the capacitance, etc) but in practice I haven't had any noticeable issues so far.
I started using them after noticing them in quite a few SMD pedals that are rather highly regarded. I gave them a shot in one or two first and was satisfied so have started using them pretty much across the board for my personal builds and PCB verifications. I still try to use the larger film box footprint when space allows, just to leave the choice up to the builder, but in some cases there just isn't enough room for anything else...