No update in the near future for the HL 850. I use it on doors. So do many other carpenters. It's a bit big and bulky compared to the Porter Cable 126 / 9118 , however the dust collection adds a lot to the benefits. Just go easy and make sure you are able to make a smooth pass from start to finish without jerking it or getting the hose or cord caught. Know how to use a plane, whether powered or hand tool, first. Press down on the front shoe as you enter the work and gently shift your pressure to the rear section of the plane/planer (full area behind the cutter) as you finish your pass. Otherwise you will get unevenness and gouges that will be difficult to correct with more passes, unless you cut the piece with the TS55 for a clean start.
Gary Katz has info on using the HL 850 on JLC and maybe This Is Carpentry as well.
Understand that with the HL 850, zeroing the cutter height is a bit tricky. You can't go by the gauge near the handle. 0 mark is never on and there's a slight amount of variance when using the gauge and lowering the front to get a zero cutter height, then doing it from the other direction, raising the front to get a zero cutter height. -- You'll see two different readings on the gauge, is my point, so it's not to be trusted.