I have also bought this mugen power battery for N900 and got it just a few days ago.

bonsai009 I would just ignore the battery indicator and green light and charge the battery while the device is on for fully 12 hours and repeat this procedure 4 times (as is stated in the manual) ... at least I am doing that; just 2 times left

So my first impressions are quite positive; the battery lasted for at least 18 full hours (after that I went to sleep and in the morning the battery was empty, so it could be even a few hours more), before that it lasted half of that time (the original one). I don't know if I'll gain even more time when the battery will reach its full capacity after this initial charges? WLAN connection was on all the time, except if a had to use 3G, during that time I watched some video news online, browse, read news online, download, installed applications could update it's data all the time, made a few Skype calls and also chat via Skype, used bluetooth connection for a few hours, the CPU is of course overclocked etc.

... so I am pleased

Obviously the phone looks and it is even bigger now, the camera has no cover anymore and the small plastic stand behind is also gone. The microSD card works fine (with this renewed cover).

Here you have also some photos (the first are made with N900 and the second one below with the Nokia 5320XM so that you can compare the quality of the cameras):



... and made with 5320XM with 2MP camera: