Very small! I got this for my big almost 4 yr old and almost 3 yr old and they look huge in it. I thought it would be big and spacious- certainly not. The shovel is of quality, the dump box is cool, it drives fast, music is neat. So there is positives but for as fast as it goes, it should be for kids a tad bit bigger.
This is an addition to my existing review.....won't charge. We haven't had it long and we have tried charging it overnight three different times, and still will not charge enough to drive. It will play the music and turn the lights on for a little while, but will not drive more than 30 seconds after a full overnight charging session. 
I submitted a return today, says the manufacturer will get back to me within a couple of days regarding the issue. So we will see if they uphold their end. I will update on here.