I've got one as well and have to agree they are great. Mainly use mine just for the pillion but have used it a couple of times now on solo journeys and found it comfortable.
I think they actually look better on the Spyder than the standard Can-am backrests (that statement is probably going to upset people

)
Only thing I don't like is that the bolts don't have covers on the inside (see last photo). Haven't managed to find any covers large enough to cover these.
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Best thing for me was the price because in New Zealand the Can-am dealers want NZ$1400 (US$1130) for official the luggage plate and back rest:yikes::yikes: This one was less than half that.