Paying for LNAT courses?

Hi,
Was just wondering if anyone has any experience with paying to go on an LNAT prep courses- does it help, is it worth it, and how much did you improve?

http://www.oxbridgeapplications.com/...-courses/lnat/

^ This is what I'm currently looking at, mainly because I'm worried about the Essay and knowing if what I'm writing at the moment is good enough for unis, but the cost is very steep. How have other people managed to establish what standard their LNAT essays are at?

That seems awfully expensive for a course that could be quite useless. I'm currently preparing for the LNAT and I'm relying on a couple of books mainly - Passing the National Admissions Test for Law: Third Edition and Practise & Pass Professional: LNAT, and these books seem to cover both sections well. Establishing the standard of LNAT essays isn't easy though; I did four essay subjects at AS level so I'll basically evaluate them as if they were for those subjects, particularly Lit, but it isn't perfect.

It's worth noting that different universities use the essays in different ways - from what I've heard, some link them to the personal statement, while others do something else. So you can't really evaluate the standard as such; it's probably best to write in your natural style, the same way you did for your PS, and choose a topic you think you can argue with effectively, and not worry about it too much.