I haven't dealt with their blower applications but I always thought they just sold the plate that goes in between the blower and the motor, and you make up your own intercooler setup. My old ute was tuned through chiptorque and they said A2A intercooled top mount blowers go a bit funny due to the throttle being before the charger (I didn't really know or care what they were talking about at the time) but they said they were on top of it - and this was close to a year ago.
W2A intercooling is a lot harder to make from scratch too - you've got your radiator, pumps, reservoirs, Intercooler and plumbing to worry about - which is also a lot of weight. You loose about .2psi through the system though, which is very efficient. I've seen some systems with a 1% pressure drop on the internet.
A2A requires an intercooler and plumbing - I managed to get a mate of mine in Brisbane to do the whole thing for me, it cost $1500 using stainless steel piping TIG welded including all the brackets and intercooler. It lost about 1psi in a 10psi system, but gained about 60NM of torque. using silicon and alloy piping you could do it for a fair bit cheaper I reckon.