Had this case for nearly 4 years now. It's looked after my SV-1 vey nicely. Hasn't held up all that well in itself - the latches themselves are a bit worn so it can take one or two goes to close it but they still work. The foam on the inside came loose and has left some glue residue on the side of the keyboard and it can make it a bit hard to close, but again it's no big deal and I'm sure the residue can come off.
Pros: Protects the keyboard very well.
Cons: Foam inside not very secure, no rubber padding on the two side handles makes it sore on the hands when 2 people carrying it and with the weight of the SV1, one person isn't very practical.
All in all, a great case that's inexpensive if you want something to protect your keyboard well, one or two smaller durability issues but they don't affect its overall performance too much