They are fine for just messing around with a portable trap or something. I have a set in 28ga for my 12ga O/U.
They shoot dirty, pattern well enough to break clays at 20-25yds or so. Sometimes the empty hull will stick in the skeeter and must be removed with a stick or something to poke it out.
I bought them to see if my gf would like shooting clays with out the pounding the 12ga was giving her. She did and I bought a 28ga for her. Havent really used the skeeters since.
About the chokes...........I really didnt notice a difference on the pattern regardless of the choke I was using. You pretty much end up with a skeet pattern.