A friend of mine bought one of the cheap ones at a Show last year - about £55 - he used it on a less than smooth garage floor, and before long the cheap caster wheels collapsed!
He luckily has managed to source some replacement wheels - but feels, in hindsight, it was a bad purchase.
I managed to buy a S/H Telefix Motoboy mover from eBay this month, and am delighted with it - really well made, and with double nylon wheels, rather than single plastic ones.
I paid £45 delivered - they are available at about £80 new - but well worth the money.
I use mine for my 1100GS in the conservatory, on a loose mat, and find I can put the GS on the stand single-handed, and to move it about is easy - front wheel on the deck - pull the back over, then rear wheel down, and pull the front over. The bike balances perfectly on the stand - whichever wheel I put on the ground stays there - and it all feels very secure.
Brilliant buy - wouldn't be without it!!
Mike