I have spoken to several people who have ACE 860's and they like them.
I know Al had his problems getting his manufacturing and distribution sorted out but it looks like things are fine now. A 59 blower can go a lot higher than 10HG and the stainless waste tanks he manufactures can take the vacuum.
There is a double exchanger system available for the unit but I would like to here more about this low temperature stuff.
Who else do you know that makes a stainless steel unit with a 59 blower and a John Deere diesel. The pricing for this unit is incredible.
No I don't own one.