Deals on used welders- come & go usually the best ones are when you have no $$, That deal you passed on was no deal, the dude wanted too much $$.
I looked at the MM210 the other day- not a bad looking little machine
You are going to hear some talk about the MM210's aluminum hook-up advantage- when you do ask them to post pictures of their Aluminum welds or aluminum projects done with their MM210....
You may hear that the MM210 has a 'better drive setup'... oh really,ask them how close the wirespeed setting (0-100), is to what actually comes out've the machine. Since the MM210 does not calibrate inches per minute on the face/control . Just have them turn it to the middle position should get somewhere around 350 inches of electrode in a minute and max the knob out this should get them 700 inches of wire in one minute, Plus or minus 10% is what you should demand.
Things you can do in the store are to pull the drives rolls on and off of each machine/load a spool, you wont do this often, but it will give you some idea about ease of use for each drive system.
Do some surfing at this site and over on Ask Andy, this should make it clear that owning the MM210 would give you access to many, many owners should any 'operation' /problem/success, type questions come up... very big bonus if you dont know how to mig weld. As long as the advice is sound
Both machines come with a 3 year warranty and if you do not get your $$'s worth outve them in that time-perhaps you should have spent the $$ on something else
I am not objective in this matter however, but if I were, the Miller would not be a bad choice
