What are you trying to achieve?
Professional results everytime means that a Vax or similar (that's what you'll get for approx £200) won't do it, the ads on TV only show you what they want to that's why professionals have to spend £ thousands, if all carpets were that easy to clean I personally would buy a vax it would save me a lot of money and I'm a poor Yorkshireman!!
If you want decent results everytime as not to let yourself look silly or let your customer down then be prepared to spend a bucket load more, infact use the SEARCH facility on the forum you'll get a better idea.
Shaun