Here is a nice comparison of portable welders (underhood stuff)

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http://www.parksoffroad.com/miscinst...weldermain.htmI recently reinstalled my zena into my truck.  One downside to the portable-- mine is installed piggyback, I replace my alternator, then had to make some adjustments to the alignment of the zena pulley-not a small amount of time.  Also, I discovered that the small v-belt I had been using was rare, I had much searching to do before finding a replacement.  Went to Autozone, Advance Auto and NAPA.  NAPA rep. found a belt after much searching.  I also ordered one from a industrial belt vendor.
Reply:That link was a very interesting read. Any one considering one of these could get a lot of good info out of it.