i was told about ace medicine and so bought that, as this was my third year appying for medicine and i wanted the best possible application.
i have to say it was extrememly useful, much more so than the 600 Q book. as it had oer 3000 UKCAT questions i just practised loads and bumped my average score up by about 90 (from the previous year). i found the questions to be pretty accurate to the actual tes, with the QR and DA being slightly harder (DA had multiple choice answers which were very similar so you had to have a better uderstanding of the code, whereas in the actual exam i found it really easy to pick the correct answer as most of the time it was the only one that actually fitted the code, and all the other choices were random). so even though they were a bit harder, it was more beneficial as it helped me to get a better understanding of the section.
i found the VR much better too, the answers made more sense and were more like what the exam was, where as i found the VR in the 600 Q book really hard, and also really hard to understand how they got the answer they did (VR was my hardest section).
AR was really good too because of the sheer amount of questions available, so much more practise and exposure to the different types of patterns there are.
overall...i would definitly recommend the course. although it was really expensive, i also got the interview course thingy and that was just amazing and i have no doubt that the whole course helped me get my place.
so yeah, like i said i improved my av score by about 90, and my biggest improvement was 170 in DA (from 690 to 860) - proof that it works!!!