i know lots! i have one! in relation to your questions!
they give much trouble its a subaru!
they are nice to drive its a subaru,
and they are expensive to repair its a subaru!
but seriously! they are great! if you dont mind the autobox! the shifting on the wheel is fine, if a little delayed! its like press....................shift so you have to anticipate your gear change and actually change before you need to, to get it to change at the right time!
the autos have 20 less horse power over the manuals! but have longer gearing on the final drive so in essence are more economical when on a motorway! marginally
they tend to run less boost too! about .7bar primary and .9bar secondary are the "factory figures", the manuals have .1bar more on each! but alot of the time they run the same,
thats about it really, most the rest is the same as the manuals!
but if you are wanting a B4, GET A MANUAL!!! especially if you intend to drive it properly! i took mine round the German Grand Prix Circuit and the Nurburgring and overheated the fluid on 3 occasions! not fun
Manual for real drivers
Auto for comfort and convenience (or people with only one arm)