I bought my Weber performer a month ago.
1.The wire grill design is cheap and dumb. I discarded it and replaced with an after market coated cast iron grill. 
2. The bail system that holds the lid will eventually scratch the paint and will rust and ware. 
3. It didn’t come with a cover like my Smoky Mountain Smoker did. For the price point, it should be included. 
4. It doesn’t seal. 
5.The ash collection needs a grip installed on the handle. I plan to build one to retrofit.