Hi Shun Jian Lee,
I've used C615 and C525 with my RasPi 2.
I have a live demo up for them on my site if you want to take a test drive for yourself. Bear in mind I'm not using full resolution at all, because I've optimized video for speed rather than quality.
Logitech C615 (looking at a robot)
Logitech C525 (mounted on a robot)