The new units are produced in China and I suspect it is now all aluminium to keep costs down. The reason they are now produced in China, is to keep up with demand, and to keep costs down so Sander can make something to feed his family and hobby.
The writing is now also printed on the aluminium case, instead of having the red sticker on. The reason for that, is to ensure everything is lined up properly which is not so easy with a sticker.
I have an all-aluminium unit, and I think it is still sexy and looks like a quality product. I would buy it again in a heartbeat.