I was not able to use a lot of the Symbian applications that I found on the web, as the phone produced an error like "can't install application".
How is the call quality and reception?
The reception is excellent. My office normally gets horrible to nill reception on my older phones with the GSM 1800/900 network I'm on; the O2 XDA Neo, Sony Ericsson w550i, Siemens S65. I'm happy to report that the N95 does well in this area.. as have most other Nokias I've owned.
Screen readable in direct sunlight?
YES! My balcony faces east and I was testing the GPS function in bright sunlight yesterday morning. I could read the screen fine.
How is the build quality?
Can't say really. It's ultra-light for it's size and I'm scared of doing much with it.
How is the web browser and WiFi reception?
Web browser is typical Nokia-Symbian. WiFi reception is acceptable. Again, I was downloading GPS maps on my balcony and it seemed quite quick. My old XDA didn't do quite that well with WLAN reception.
By the way, I took a quick video today with my phone. I uploaded it here: http://video.canadiancontent.net/11997520-nokia-n95-video-sample.html
Edit: The video recording does better with more suitable lighting. As you can see, my apartment is quite dark with the blinds closed