Had one and brought it back to Menards for a full refund..
Why?
1) there is no base / platform to rest the saw against your work
2) there is no way to guage where the cut line will be or to see where the blade is about to cut. This is primarily due to the blade shield which immediately fills up with saw dust (I only tried it on wood)..
In short, it is nothing more than an angle grinder with counter rotating saw blades and as such would be exceptionally difficult to use with any precision.
Thanks for the responses. Sort of what I figured.
A friend has a custom rod shop and does a lot of sheetmetal fabricating. I thought it might be a step up from freehand cutting with an angle grinder.
jack vines

I saw (no pun intended) one at Costco the other day.
I think they're interesting as a mechanical novelty, but I can't think of a situation where it would be superior to a normal angle grinder or circ saw. Why would you want a kerf twice as wide? That means twice as much dust/shavings and wasted material.
Solution in search of a problem.
A friend bought the HF model and we used it to shorten a Suburban frame. Some observations...
1) Throws a lot of HOT metal chips so wear safety glasses and hand/arm protection.
2) It does need the "lube crayon" to work effectively without burning up the blade
3) While it is challenging to hold with no quides, it doesn't really turn fast enough to kick, just take your time.
4) The housing gets pretty hot so wear some gloves.
