Been on Lamictal for 2 years now and won't stop it. Lots of people in the comments' been on it for years which should say a lot. it's got minimal side effects. The rash is extremely rare, I never had that problem. It is also supposed to be weight neutral, as it was for me. To my understanding it works better for mania and hypomania than depression. In the time I've been taking it, I went back on Wellbutrin for a while but couldn't handle side effects, tried an AP which didn't go well with me and now finally started an AD. So, for me at least, it didn't keep the depression at bay.
I do however feel much more stable on it so yes, I hope you go for it!