I have to agree that if you have a stick welder for bigger stuff AND want more portability, the newer MM211 is a good choice - Before I got the 252 I had the original transformer based mm211, MUCH heavier than the newer MM211 - I doubt I will EVER sell the 252 while I'm still BREATHING, but I have a few places I need to weld that are either outside, or just without the power required for the 252; so I bought a new MM211 a few months ago - not seeing a noticeable difference in arc from the MM252; also, Miller addressed every shortcoming of the earlier MM211 - weight is less than half, autoset is MUCH more flexible (manual is still there, which I tend to use), fan is now "on demand" instead of always on, the inverter can handle "dirtier" power inputs and 50 OR 60 hZ - my only complaint is that you have to buy a SEPARATE 15' gun if you want one, they will NOT let you "trade up" for a little more $$$...
I built a "4-way movable" cart for it - it can move around on smooth floors using 2 13" tires and 2 5" swivel casters, or I can tip it back on JUST the 13" tires and move it like a hand truck (shorter trips on gravel, etc) or I can flip its "trailer tongue" down and TOW it with my ZTR (the smaller casters retract for this), or (finally) its "roll cage" has a 2-way adjustable "picking eye" so it can be balanced to hang straight regardless of things like changing spool weight/bottle weight - with that I can either pick it with the backhoe or a crane and set it on a trailer or pickup bed...
The "roll cage" is also designed to protect the gauges, as well as support a standard "barbeque cover" during periods of non-use - here's what it looks like... Steve