I have a Hein Gericke one piece that I bought in Cologne, Germany back in 86. I do wear my FT's for my daily riders if the rain is spotty. I have ridden with a friend that wore his FT's in rain that would have drowned a frog (all day) and they were fine. With that being said, the HG one piece has been with me since 86 and I would never take a trip without it. It's a little bit of a pain to put on and take off, but in 25 years has never leaked a drop. And it is quick donning. Velcro and zippers on the legs to put it on with your boots on, and a double fell front zipper with foldover flap and built in bib. It even has a map pocket on the thigh. I love it and hope it lasts another 25 years. But with Goretex and all the other options available, you should be able to find something to suit YOU. That's pretty much how it is. My one piece has served me well. Oh yeah, even back then, Dayglo orange upper part, reflective tape, etc, etc. Check out this link. Looks like the have followed the same concept,
I know it's U.K. but the price? 51#. They do have a U.S. component I believe.