After 2 weeks of using "A Better Camera", I'm sad to say that I'm not totally satisfied with the purchase and application (my personal experience).

Issues I'm encountering:
1) Slow to start application and taking pictures (compared to the standard camera).
2) Unstable sometimes (I've encountered a few times when picture saving takes too long and crashes the N900 - I had to re-start the phone by removing battery).
3) Picture quality can be better (I'm referring to the red/blue specks)

It's good that A Better Camera gives the N900 more camera features than the standard one. But the performance can still be improved. I guess it's not possible to expect digital camera performance and quality on a mobilephone, but I hope the developers can review to improve (or guide me on alternative fixes) the points I mentioned above.