I have been seriously looking at buying one of these. How long have you had it?
Had it about 10 years, I have welded sheet metal(lots), steel up to 3/8", alum., and a little stainless. I haven't tried cast yet, they show cast being welded on there website. It cuts as good as the plasma cutters I have used(maybe better). Uses almost no gas.
Plus+++
$500-$600 buys torch, gauge set and tanks.(depends on how much your local dealer charges for tanks).
Portable can take to the field.
With a little practice it will replace a Tig, Mig, Stick, and plasma cutter.($$$$$$$$$$$)
Tanks last forever, uses very low pressure.
Minus----
Not as fast as a stick or mig or at least I am not as fast.
Have to change tips around to cut, not as fast as throwing a switch on a plasma cutter, but with the money I saved I don't mind. Plus that plasma cutter won't do you anygood in the middle of nowhere. Where my torch will go anywhere.
I would say if you have a LOT of fab work to do nothing will be faster or easier than a mig or even a stick if you are welding dirty. Most of the stuff I do is repairs and small fab jobs and I can do as good a job with the Henrob as anything I have ever used and only have the one piece of equipment to buy and take up space.
One shortcoming of any torch(imho) is the heat needed. I welded a 3/8 plate to my bucket on the loader, for a receiver hitch. The bucket is big and draws a lot of heat it took a little longer to get a good puddle but it worked just fine just not as quick as a mig.
On the same note I had a tork screw on a motorcycle that the mechanic used a allen wrench on and stripped the head out

, it was surrounded by a plastic piece. I would have liked a mig to tack another bolt to head of screw that was messed up but my torch couldn't be used because it would of melted the plastic. Just had to figure another way.
Overall the Henrob has never failed to surprise and impress me with what it will do. As I said above I would pay double for this tool.
Hope this helps.