Tools & Fabrication - Lincoln TIG's square wave 355 and Precision TIG 275 questions

I have been looking for a nice used welder for a while. A local fab shop in my area is going out of business and has a Lincoln TIG's square wave TIG 355 and Precision TIG 275, both seem low hours and good shape. I have used a Precision TIG 275 and like it alot. I know the square wave 355 is a big machine but if i can get either for the right price i will buy one. Have any of you guys had experience with either of these machines?

ive put millions of hours on both machines you cant lose on either one
if one has water cooler and pulse panel get that one i have precision tig 275 with pulse and water cooler works amazing
Beaudacious

Water cooled is definitely a must, sucks having to wait till the torch cools down while you are working.