They are excellent little TIG welders.
Nice arc.
X-ray quality welds.
Some aerospace companies have gotten rid of the bells and whistles and bought Maxstars for thin gauge materials. (I thought they were kidding when they replaced my AIRCO Heliwelder with a Maxstar). They can be moved easily to any workstation by simply unplugging and walking to the next building. Argon/helium manifolds and power outlets were about the shop. Good for "modular" application such as this.
Did I mention nice arc?

I broke from Blue and now own a Thermalarc 140.

I have a Maxstar 200. Its a great machine.

I have one of the old 140s without the remote connection. It is a great little machine. Have done quite a bit smaw and only a little gtaw but I couldnt be happier with it.

HI,
The best way to tell (for me) which small inverter was the best was to try each one by burning a stick or two of lincoln 5P (1/8 or 3/32 size). Not all inverters will burn it. Some will only burn 6011. The miller burns that red 5P really well. The small lincoln that I tried a while back didn't like it at all! If it burns 5P well it can handle everything else without a problem( IMHO). I have an AIRCO mini-arc 130 that is one of the first small inverters made. It will not burn 5P. It works well with 6011 and any 7018, and is great with DC TIG. The only drawback is that I have to remember to throw some 6011 on the truck when the inverter goes along. When I purchased the Airco, miller, hobart & thermal were just coming into the market and the airco was by far the most usable unit at that time. I used a friends miller 140 the other day and it was SWEET! If I were buying again, it would be the new miller! Good Luck!