It ain't bad Hugh.
the lorch (tweco) is a heavy lump. Deceptive actually given its small dimensions. I'd imagine (just a guess) it's because it's got added structural work inside to ensure it survives its 2 foot drop test?Cooler comes off though on the EWM making it pretty hand portable, just means two trips from the van to the job if you aren't using the trolley.
The Rehm size and weight is in a league of its own from my experience. But from a service POV even I can see it's a nightmare and I don't know what I'm looking at. Providing it doesn't break down you'll be ok but if it does expect a heavy labour bill before any parts are exchanged because every item is so tight to get into you are looking a major strip down to get to any of the components. It's still laid out nicely in the respect that boards are kept out of air flow with wind tunnel heat sinks etc and quality parts appear to be used and placed in areas to avoid damage. She's a compact tight fit in there. Price wise it seems a dear machine but it's on par with its German competition. We see them as particularly pricey over here because they are not commonly known when bought up in discussions on high end kit in U.K. In Germany they are as highly regarded as lorch ewm Fronius etc as been a major player. Mine was brilliant and the only machine I'd of traded it in for was a 2200 (which I did) the thing that surprised me about the Rehm was it didn't lack in features despite its lack in size. It was very well equipped with plenty of rubbish that these techy welders like to talk about.I know the Rehm is a high quality machine but I imagine a fair bit of its price tag, which is fairly high for a single phase machine, is the R&D that has gone into that weight saving.
I just got a little bose soundlink mini speaker for the workshop, and it weighs about 3kg yet is only 50mm wide, 200mm long. Proper quality item though, and when compared to something like a gear4 speaker of similar size it's double the weight.