Bought this for a buddy of mine who doesn't do internet. He loves it but says he wishes he also had the standard bone for getting under semi trucks and trailers. This one is a little taller for that but rolls nice on rougher surfaces, even outside in the gravel yard. One nice feature is that the wheels are covered, on a lot of creepers I get my jacket or the extension cord caught up in the caster wheels. Update: Just purchased another. They fixed the issue of people bitching about the headrest...eliminated it altogether. still a must have creeper for rough surfaces and uneven concrete, but will not work in loose stone driveway.