I don't know if they've fixed the issue, but the Box client used to spike CPU at 100% on OS X. This would occur when you have a folder hierarchy with a lot of small files in it.

It turned out that their client was enumerating folders and files looking for changed data rather than hooking into the OS X file system notifications. We really liked it for the corporate account since it's possible to selectively grant outside parties access to files/folders.

Yep...Came here to say the same thing. They also had a 250GB promo a few weeks ago, but with a 250MB cap...it's really not going to do wonders.

ref: http://bensbargains.net/deal/25gb-cloud-storage-account-free...

Yeah, thats the catch, and its a big one. I tried switching once because of this same "offer", and went back to dropbox. It's funny how a service that got more popular first makes you feel more secure, and for probably the same reason all my clients have dropbox, so when they want to share assets thats what they choose.

Hmm, someone make a plugin for Box now for splitting files into 250MB pieces and also recombining them.