Like Gav I can only speak for CR. I am very happy with my kit, but there are a lot of things that I think could be done in the factory to improve it. The manual is limited, and there is no way your average joe could build it based on just the manual. Lots of little things that arent made clear, and lots of details are omitted. This forum makes a huge difference, and everyone is very keen to help. If it wasnt for this forum and so many people on it building the same car, and knowing I could learn from all of them, then I may have chosen another. I think you just need to look through old posts to see there are more build detail posts on the CR then any other make. This could be that the manual is so useless and us builders have had more problems then any other make though
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Id still choose the CR again if I had to, but thats not to say its the best. The harrison is clearly a great kit, and there are a lot of them beiong built particularly in QLD at present. I think the G-Force has a great shape to (to me looks most correct out of all of them), but I dont mind the chunkier look of the CR either. My knowledge or cars and car building was pretty much zero, but youll ALOT as you go along. With the numbers that have gone before me, and what I can learns from them, I feel confident I may even finish one day.
Cheers