Cusco,
I have used the Sim up at Toms and its pretty good.
He will work you hard in it but you will come out knwoing your procedures alot better than when you went in. If I remember rightly he charges about £50/hr for its use, much cheaper than waiting until you are in the air before you find out you have forgotten everything!
Like all sims it takes bit of getting used to when you first get in in, cranking the yoke over like you would do in the clubs aircraft tends to result in a half cocked barrel roll !!!
Julian.