Aside from the improved motor drive algorithms, there are the usual bug fixes. The changes are listed under the Mamba FRH page. It doesn't mention the motor drive improvements as they were already present in 1.19 and 1.18 (which were only really meant for the Monster anyway). If for whatever reason you don't get along with 1.20 then you can easily move back to 1.17, but from what I've heard, it's a marked improvement.
I'd use it myself on my Mamba Maxes, but I got a new PC which runs Vista 64 before 1.20 came out...and Vista 64 won't recognise the Max. Driver issue, lol.
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