Is it worth hiring one? (can do this from their website) As they're quite pricey.
Try and buy a 2nd hand one if you can afford it. When you sell it on you'll most likely get your money back. If you want to buy one then be sure you're going to use it. Other wise you have one rather large and expensive paperweight.
I bought a Model D for £700 and sold it to a businessman from Surrey for £800 a year later (this was before the Model E was out).