I have been diving it now for about 5 years and love the BP & wings versus the other BC's I've had (most recently the Balance). It is really no different than others I have tried (Halcyon, Diverite) in how it performs underwater, the only differences are the nuances....d-rings, wing styles, accessories, etc. I like the idea of the weight pockets, but then most others have them too...but this came with them included in the price. I ditched the single tank strapping and got the Halcyon Weighted STA (straps were better, had weight I could remove if necessary, etc). Also have the MCA pack by Halcyon for the SMB storage.
The bladder is not as protected as some with and outer shell + inner bladder, but it seems to have held up pretty well with a trip every year to Cozumel, ice diving, standard fresh water lake diving and some pool work.
With all that said, I just bought a Halcyon Aluminum backplate for traveling, mainly because I wanted the Halcyon Quick Cinch system...which did not fit on the Apeks plate. I am retro-fitting the Apeks weight pockets onto the new plate and it will work with the cinch system.
Other than that...nice setup and I got it for a great price so no complaints on it at all except for the single tank strapping which I changed right away.