Just published my thoughts on the 8320s over on my blog. Needless to say, I'm impressed.
Same thing here. The JVC Marshmallow tips on the 8320 are AWESOME.
I too just got my pair yesterday and they are great. I am not a huge in-ear fan, but I needed these for outdoor activities.
They are able to handle a lot of base when asked and do not distort like more expensive models I have tried. They have an amazing range, very crisp across the entire spectrum. Definitely the best in-ear model I have used.
Its amazing how great they sound for the price. I also love the cable material, it appears to be durable, but time will tell.
In a nutshell, if you are looking for a great pair of in-ear headphones, you can go wrong. I appreciate all the great reviews in this thread, you guys were right!