Thanks for all the comments, interesting stuff!
I guess no-one will be surprised to hear that I'm struggling to get good, usable sounds out of the XL, that complement what the Snow can do so easily. There's plenty of samples to make use of, good filtering and plenty of arpegiator features, but I'm pretty time-poor, so just haven't got hours each week, to program every single sound I need.
Haven't decided to sell it yet, but guess I'd better give it some thought.
Cheers,
EG