Quite simply the best toy ever. I bought this for my son at 12 months. It has been in almost daily use for 5 years since then, now mostly by his baby sister (19 months) but he still has a spin on it when he can (although he's far too big now).
Both children started using it backwards, pushing it about like a brick trolley, and progressed to clambering over it and sliding off, before using it 'properly' and sitting astride, propelling themselves with their feet. They can get up quite a speed, and it is very easy to control, having castors instead of wheels.
This is just so superior to the bright plastic (often electronic) ride-on toys that most children are bought, and lasts a lot longer. It has been wee'd on, had all sorts of unpleasant substances all over it, been crashed at speed into the furniture and been ridden inside and outdoors, yet is so sturdy it looks as good as new.
It's an absolute classic that I think no home should be without. The perfect gift for any 1 year old, and for years to come. Ours is really just another member of the family now. (Incidentally from a parent's point of view it also looks much nicer in your home than the cheap plastic rubbish you normally see!)