I found this by accident, a new plane by German tool maker Ulmia. The Alu-Line HA48-1 is Ulmia’s first metal plane, made of aluminum and recycled plastic. It reminds me a bit of the plastic-metal planes made by Swiss company Rali. It has a solid aluminum anodized plane sole, and a low centre of gravity. Adjustment of the plane blade is provided by an eccentric lever, with a cutting angle of 49°. The plane sells for just under €200 in Europe. The exchangeable knife is held on a solid steel plate with a second exchangeable knife mounted above it and acting as a chip breaker – each knife is reversible, providing four blades. The knife unit is held together by magnets.
Will this plane be popular? Unlikely among core woodworkers, I mean who *really* likes a plane with replaceable blades, although it might be extremely useful on a worksite. The Rali planes have been very successful, at least in Europe, but they offer a full family of planes, including bench and rabbet planes. The HA48-1’s Achilles heel might be the aluminum sole – there really haven’t been too many successful aluminum planes. There is also the aesthetics – it just seems a bit clunky, unlike the Rali planes which seem more ergonomic, and look better (and the seams on the handles are just ugly). Would the fact that it’s made of recycled plastic sway people? Probably not, I’d prefer to see recycled plastic used in building materials. Now a hybrid wood/aluminum plane would have been interesting… perhaps made of off-cuts from the lumber industry?
Frankly I think the biggest issue may be the price – at ca. C$290 you can buy a Veritas Low-Angle Smooth Plane for $7 more, and the equivalent RALI plane, the “220 Evolution N” is only C$227.
working by hand 
It sickens me to this plane. That say’s it all.
I will not use a plane with throwaway blades to save plastic!
Where is the “green” logic in it?
And then, plastic doesn’t age well.
The only advantage might be the weight. Does anybody do backpacking woodworking?
Yes, it does seem an odd choice for a company that already uses sustainable materials.
Why even bother going down that path?
I’ll buy it. When the last vintage Stanley #3 vanishes from the earth.
On a more serious note. It looks like a toy.