I have slowly been increasing my Lamictal for about 3 months. I have found basically zero side-effects at lower dosages. I'd started to feel a bit sleepy at 300mg and went back down to 250mg.
Everyone is different and may have a very different experience with any med.
Docs and patients seem to like Lamictal for its efficacy and it's relatively low side-effect profile, in general.
Treatment with Lithium is more complicated, including blood tests (lithium levels) and the ongoing potential for lithium toxicity. Many are happier with management via Lamictal, if it works well for them.
I am sure you have been advised to keep an eye out for, and to report, any rash. The Lamictal- induced SJS rash is unique and is potentially very serious. A very small percentage of people experience this rash.
Please do report any rash in order to be safe.
I hope Lamictal works well for you!

WC