Sapphire might be a little overhyped, but it really is a rock-solid game overall and certainly worthy of much of the praise it gets.
Yes, its very nice. Clearly the #1 ACD but...it could have been better. The art direction in Sapphire is just all over the place. I realize that since time travel is part of the plot that this sort of thing is inherent, but it could still be half as coherent as it is technically impressive. Also the sound effects are annoying and loud. The music seems nice but its quieter than the music in, say, LoT, so I can't enjoy it as much over the shitty sound effects.
Its a nice game, but I really think both Gate of Thunder and Lords/Winds of Thunder are very much better. Also there are quite a few SCD shooters I keep hearing are great that I've never had a chance to play that are also probably better.
Fatal Fury Special is also very nice, but now that the MVS cart can be had for $10 its not very relevant. The whole point of console ports of Neo Geo games was that you could afford them, so now all the Neo Geo ports, as amazing as they are, are pointless.