I developed 4 rolls of 120 on SS reels this morning - two double SS tanks (each tank holds two 120 reels and a 35mm reel). The loading went without a hitch -- don't know the brands of the reels -- a mixed collection. The reels and tanks were a little damp (someone used them the night before), so I dried them quickly with a hair drier. I started one tank developing 2 minutes before the other.
I do mosly LF, but learned photography with 120, and have always found that 120 reels load easier for the beginner than 35mm (both formats using SS reels). I have gotten good with 35mm on SS reels (all brands, but Hewes kick ass) after helping students for the last 20 years. We have plastic reels and tanks, but I have never used them. We have had to replace the plastic lids for the SS tanks, but the takns themselves are too strong to damage. We have boxes of them -- much more than we can use! The SS reels don't like being dropped, though.
We (the university) got a little extra money at the end of last year, so we bought 24 Hewes 35mm reels -- I see far less bad rolls of film from the students this year.