The good: the PowerMat works very, very well; the backup battery is pocketable and useful; the case is simple get the phone in & out.
The not-so-good: the phone case is too smooth, no "grippy" surface at all. It can be a tad finicky about placing the case "just so" but the auditory feedback and LED are excellent in letting you know when you've put it right. (The battery backup seems better in this regard - drop it on and it's charging.)
My case came defective - the microUSB port wasn't working. This gave me the chance to interact with a4c's support: answered after 3 rings on option 2, the representative was friendly, knowledgeable, understanding and helpful (a truly rare skill set in support) and looked up the possibility of replacing the single defective part (instead of initiating a whole package return) - I hope/trust the rest of the process will proceed with as much convenience. Kudos to the company.
I wish I could do half-stars - I'd give 3 and a half for quality, taking into account my experience with a defect. A redesigned case would net a 4 and a half.