I've built many models over the years and found AA about 10 years ago when I built their CRARRV, I was amazed to find in the decal sheet my VRN from my CRARRV when was attached to a certain tank Regt, I based the model on my own vehicle and was really happy with the results.
Having only previous experience on mainstream kits I was a little daunted by what I found in the box, the individual parts took quite a bit cleaning up ie, removing excess resin etc, I found the best method was to cut most of the excess away using a model knife then finish them up with needle files to make them perfect before assembly. I did have a problem with one part in particular which snapped in half, however when I got in touch with AA they were awesome, they had a replacement sent to me straight away, no dramas.
I spent around 3 months on the model all together (I know I'm slow) but this paid dividends on the finished model. In my opinion a model really comes alive when painted well, I again took my time with the spraying and weathering and was really chuffed with the results.
Obviously not aimed at beginners but with a little modelling experience these kits are a joy to build and give a nice sense of achievment once finished, just wish they were cheaper:(
Just had a look at the KFS kits, wow impressive.