Hi toyds, and welcome!
Yes, the SD700 has great image quality.
To be honest, you can expect too much from a tiny built-camera flash, not only in the SD700 but most compact digital cameras.
You can minimize the dark corners in a couple of ways:
- make sure you use the flash within the recommended range for the focal length!!! This information is in the manual.
- don't shoot using the widest camera angle; zoom in a bit.
- whenever possible, increase room lighting.
The video quality of the SD700 is quite good but the audio is nowhere near the quality of a dedicated video camera. My main recommendation would be to get as close to the subject as possible when recording sound.
If you haven't discovered it already, you may find some of the tips in my
SD700 blog useful:
http://www.digicamhelp.com/camera-logs/2/