It's an unfair comparison: one's a rotary surface "planer", the other a gear-driven planetary/random orbital sander.
They're both the same type of machine, an angle grinder with a milling head on it.
If you'd actually explored the links, Alex, before launching your inappropriate diatribe, you would've noticed the "comparison" video between a Rotex 150 (with a poorly-fitted 6-hole abrasive disc) & the Eibenstock. A Rotex isn't an angle grinder, despite having superficial similarities. But you already know that, don't you? I'm not quite sure why you're pretending it is.
THIS is the "unfair comparison":
The Eibenstock & "Unitec" EOF 100 (which is also an Eibenstock) shown in the links are the same machine: same model designation, same livery, both fitted with a 3 carbide toothed disc but with different voltages, but they're being COMPARED (unfairly I contend) to the Rotex, which is an altogether different machine. A Rotex would, however be an acceptable follow-up machine for surfaces processed with a paint planer. A standard Rando & Delta Orbital for the corners would be better still.
They're messy machines. You need powerful extraction. As with any planer, they produce prodigious amounts of swarf. Using a 36mm hose on my Metabo LF724 is advantageous, as will keeping all 3 of those flimsy little plastic doors shut. If you lose or break one off, dust & chips are propelled outwards irrespective of the vac attached.
There's also something of a "knack" to getting the best results & least collateral damage in the fastest possible time. Starting off with the cutter protruding slightly less or just level with the paint thickness (measured in 0.5mm increments) is wise. Even when accurately set more than one pass is usually required unless you set the cutterhead to gouge into the substrate too. No painted wooden surface remains perfectly flat & planar. It's wood, so it moves over time & humidity variations. So you will invariably need a follow-up fine sand anyway. The vertical cutters can be quite savage as they don't have any depth adjustment.
A gear-driven rotary or planetary sander like the "comparison" Rotex will generally be much slower & will require multiple passes with a variety of descending grit sizes.
THIS video shows a fair & reasonable overview of Metabo's paint planer's abilities & limitations. Most other Youtube vids show the tool in use without extraction, which is crazy:
http://www.youtube.com/watch?v=5YhE6GqVKrs&t=509s&frags=pl%2CwnThere's also another product called the "Paint Shaver Pro" which appears to be a basic cutterhead bolted to a variety of grinder bodies: I've seen them on Hitachi, Makita & Fein grinder bodies. Their owners seem pretty happy with them. Both the Eibenstock/Unitec & Metabo seem to be more refined & better resolved products in my opinion.