Solid. Sleek, White, Modern - SIMPLE design! Great for just putting a single mattress on. No fuss no muss with box springs and stupid dust ruffles that collect dust. Some people mentioned thin wood slats but they're fine.  A 300 lb person was on it - no problem. It's solid. Easy to assemble.

Pros: Sleek, Chic, Modern, White - SOLID! Clean lines. Goes with my white furniture. INEXPENSIVE!
Cons: NONE.