I like the diversity here - agewise and otherwise. People with different gadgets can get together and compare them without it getting too heated (most of the time). I don't feel that it's as rah-rah when it comes to one specific device, so I feel most posts are objective and balanced, and very helpful and informative.
I like that it's not as commercial as some of the other ebook sites I visit, and especially that moderators/owners don't go in and edit people's messages to add affiliate links whenever and wherever possible. (I have a background working for online communities and editing people's messages gives me hives - either remove/delete them for violations, or leave them alone. Don't edit them without the poster's permission, especially to add an ad.)
Along that same line, it doesn't seem that there are as many people here who talk a product to death (and it has no faults, mind you) and clearly profit from sales of that product.
There are more reasons, but these are the biggies, for me.