I have owned my 250EX for over a year but I was not using the original WP-18 torch that came with it due to the unwieldy size of the torch head. Its about the size of a small hammer.
I purchased a very economical replacement high capacity WP-20 torch head that uses WP-18 cable connections from Riverweld (also available on ebay) and installed it on the WP-18 cables.
This high capacity WP-20 torch uses all regular WP-20 collets, gas lenses, etc and has a rated capacity of 315 amps.
It runs very cool and I have found it to be a great way to be able to finally use the torch that came with my unit.
Highly recommended upgrade at minimal cost.