Not what I hoped for
I got my battery pack set about week and half ago. While one battery works excellent the other is faulty. My wee keeps warning of low charge. Also the indicator in Wiimote Settings section never goes beyond 2 points for this one.

The biggest downer for me is the extended Sync button. Way too sensitive. I'd rather have it slightly lower than the surface level and press it with a pointed object if needed. (You really don't need to re-sync if at all there is a software option available under remote settings.) Hey and I'm apprehensive about them getting spoilt due to overcharge.

I came across another set at a local store - the battery pack id like 2 AA cells joined together. Much better option to overcome Sync button issues.

If it wasn't for reasonable price - I'd be giving it a 1 star. I'd personally suggest AA Rechargeable cells. My AA batteries seem to outlast this pack as far as play time is concerned. (may be battery life too - only time would tell)

PS: The other product "Double Remote Controller Power Pack with Charger Stand" from the same manufacturer doesn't have any better reviews. And I think the reason why its slightly cheaper is only because of a lower rating of 2400 mAh as compared to 3800mAh for this one.

Verdict: Avoid buying.

Excellent
Very good batteries. Last for ages. Not much else I can say. Well worth the money. A definite should have for anyone sick of AAs, and want convenient and easy charging system.

However, it does have one slight problem: The 'Sync' button, normally hidden by the battery cover, is extended so that you can press the sync button while the cover is on. Very stupid in my opinion as when playing games that use the 'classic' (IE, wiimote on its side, d-pad in left hand, 1+2 buttons in left) mode, you accidentally hit the sync button during play, which makes the controller cut out.

Considering how little you will be actually charging them, it may be best to get some kind of Wiimote cover as well.