I've had the D50 for a little over a month and I'm loving it. I also just got a Lensbaby 2.0 (www.lensbabies.com), and I'm having fun with that too.
The only problem of course, is that you can't meter with a Lensbaby and D50/D70 etc.. You have to guesstimate everything.
Despite that, I still enjoy it. I just wanted to hear what other Lensbaby users thought and whether you have any tips or tricks.