My biggest hangup on modern transformers is when the altmodes are vehicles and the wheels won't roll in tandem. This can be because: 1. I tf'ed the thing wrong or the panels won't match or something simple is jamming up the jobby or whatever. Example: Moon Sparkle DOTM Prime or TFA Blurr or Classics Sideswipe mold. 2. There's too much robot that there's barely any ground clearance (ROTF HA Jazz or DOTM Topspin) 3. The thing just doesn't seem to be built all that well (DOTM Roadbuster) Other reasons or examples of vehicles where only 50-75% of the wheels work? Please note: reason #1 is the most common for me so please don't just say: YER DOING IT WRONG! For me it's usually -- hmmm. click-snap. ok. roll out!