I like it. It gets flak because it's so light that it feels flimsy, and it's so thin that you can actually flex it in your hand. But I've never heard of one that broke or failed. If you want light, the 530 is LIGHT - it is literally one of those that you can forget is your pocket. It's so thin it doesn't even put any tension on your pocket.
Downsides - the handle is comfortable, but not as comfortable as a mini-grip. It is (unlike the mini-grip) a little over 3" - 3.25, I think. So if 3" is a magic number in your jurisdiction, the 530 won't help you. Last, while it's attractive, it looks quite dagger-y, so visually it's not as sheeple friendly as it could be.
Upsides - it's a well designed symetrical grip, comfortable blade up or down, edge in or out. (Nice little pikal piece.) The thin blade cuts VERY well, even with the center grind. The clip is left/right swappable. It's made in the USA. Benchmade's 440C is excellent. It weighs nothing, but it's tough as hell.