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I've got one
Last winter I put one on my '76 W115 240D. I tried for a little while to get the existing (non-working) heater out, and gave up before I destroyed something or had to remove the starter. The hose-type seems to work just fine, convection currents distribute the heat pretty well, with the caveat that it doesn't get all that cold here (below 20 is unusual).
I got mine from dieselgiant. It even comes with a new hose. I had some trouble, in that the hose wasn't the correct one (it was about 6 inches too long), so I reused the old one. This really wasn't DG's fault, because I've looked and everything I saw listed the part number he sent. (There is a recent substitution). Since then I have seen a '75 240D and the thermostat/hose configuration is completely different. So I don't know if my car has been modified, or if it was a change in those last W115s. (for anyone with the same model reading this, my lower hose goes under the AC compressor from the passenger side. The '75 came over the top, IIRC)
Sorry for getting off track. I had some temperature sensors from Dallas Semiconductor (the MicroLAN type) so I wired a few up and ran some tests. I put sensors on the block next to the original heater, the lower hose, the hose going to the heater core, the oil pan and an ambient reading. There are some gaps, as the sensors would drop out or give a bogus reading. Maybe this will give you an idea of how it heats up. (the file is a .csv)
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