I also got one of the baskets from Stainless. Only used it once, so far. I used cone hops and they seemed to float/congeal at the top of the basket. This was the bittering addition and seemed to do the job OK, but I hesitated to throw more in for late additions because I didn't think it would mix well and just make a big mass (mess) of hops at the top. This is the smallest diameter basket so it will fit inside the IC of my rig. Smaller diameter may be a factor.
I think it might work much better for pellets, but haven't done a brew with only pellets to try it.
Nylon paint strainer bags have usually worked well for me, tied closed with cotton twine and floating in the BK, no leaks so far. They do tend to take on color, but hot PBW usually cleans any debris. I like to think of them as taking on a nice "patina".