I have a Vantage 300 and I wouldn't trade it for any other machine. 2400 hours on it, most of my driving is on service roads and still have the original computer. I fill up once a week (15 gallon tank) work ten hours a day, 60 hours at above 5000 feet elevation. 90% of my welds are xray, have not busted one since I bought the machine. Have jump started many sa200 machines at 20-30 below in Wyoming. Haven't tried the wirefeed setting yet, but the touch start tig setting is awesome. Can run a plasma cutter, while welding with 5/32 LH, haven't tried 3/16 yet. I use the 240 volt output (150 amps) weekly to charge solar batteries.
I have welded with a sa200 gas, 200D, 300D, Miller 600, Miller XMT, which is a great machine for the shop.
I have not tried the Miller Pipepro yet, maybe it is a great machine. (I did have brother-in-law welders that used them, both pipepro and the 200, but didn't see a huge difference in speed or quality.)
This machine does what I need it to do.
What bothers me is there's a lot of welders that get stuck with the mind set that a certain machine is the only machine that will do it all and there's no other machine out there that even compares.