Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wheels move when locked

I've been using this base under a jet contractor's saw with cast iron top for a few months now. The base is very sturdy, strongly made, and rolls smoothly. The big problem is that the wheels don't lock solidly, and I can't trust the saw to stay in place when I cut a large piece of plywood, etc. I'll probably buy a different base for the saw and use this one on something else like a drill press that only needs vertical support. Bottom line is it doesn't do the job for a table saw.