beware of the weak PSU, non-standard mobo
I heard the PSU has high failure rate. And it's non-standard. Mobo is also non-standard. If anything fails after warranty expires, expect to pay $$$.
I personally prefer full tower or at least mid tower. The case of slimline is so small, it's almost impossible to add a decent video card.
But again, for casual use, slimline is more than enough.