I've been looking for a used x-cal 2 and have found an unlocked one locally. And I own a SCT tuning license as well and am familiar with the process.
Here are the facts...
1) If they didn't flash the x-cal back to stock.. it's "locked". That means the buyer will spend $180-ish to have it unlocked and cover shipping. ($150 = unlock from SCT)
2) A new X3 costs $379 which includes 3 custom tunes for your vehicle at
3) $180-ish to unlock a used unit + $50 for at least one tune = $230
NOT INCLUDING THE COST OF A USED (locked) X-CAL 2!!!
4) There is a limit on how many locks and unlocks a x-cal can take. (it's either 5-6 times)
A) Never buy a locked x-cal for more than $50.
B) Never buy one from anyone but the original owner
C) Verify on the spot that it's unlocked before paying. Or.. pay no more than $50 online before verifying it's unlocked
D) Using $379 (+ tax) as a "max cost" for a BRAND NEW tuner
.. I'd knock off $100 before even considering buying a used one. So that puts a buyer of a used one at $280 total cost. IMO this is the breakover point at which I'd give up and just go buy a new one with three custom tunes.. or go find a used one at a lower cost.
Me personally.. I'm in the process of buying a locally owned, used, one owner, unlocked X-cal 2 for $175. AND.. it's going to cost me $100 to activate my license for it. So in order to get me up and tuning my 2006 Merc Milan I'll be spending $275 total. See guys.. even owning my own license is not cheap!
Just some reality checks for you guys...