I submitted probably 15 names there and about 5 got accepted. After a few months, I took them down from BB and put them back on my own landers.
Personally I think BB is pointless.
If your name is good enough, then the buyers are going to come to you. Why would I give Brandbucket 30% for basically doing nothing except coming up with some trash logo?
I'd rather control my own landers, negotiate with buyers directly, set my own damn prices, be able to see my stats, (Dan + Google Analytics) and most importantly, be able to list on Afternic and Sedo.
Now if you're good at the hand-reg game or are able to find a lot of mid-tier names for cheap, then sure, go for it.
This is just my personal experience, but sites like BrandBucket are not for me.