Radial cutter

[kins73]

Hi everyone, I am thinking of buying a radial cutter- you know the ones that have a bench of their own and slide over the top on a kind of rail. The thing is the ones that I have looked at-apart from the expensive ruby ones do not seem to have much of a cutting length-surely the whole point of buying one of these is to make life easier with large format tiles??
Can anyone advise as to what to go for?

neil