I cant comment on the APR pump as i have never fitted or sold one, but we have fitted 30+ autotech internsl kits and sold lots more, never had a single problem, personally I cant see any benefit in paying £700+ for a complete pump.
We just finished a group buy over on Vagoc.co.uk so you have just missed out on that one, but I do have a few pumps left over if you are interested, while I was in the USA I collected 50 pump kits and have approx 11 to sell and 10 to keep as workshop stock for the next 3 months.