I sort of hemmed and hawed and said ok.
When the guy came by to install it, it was kind of amazing. he opened the box quickly with a box cutter, and started unwrapping stuff. Stuff that was needed came out, extras were discarded into the lid of the box, all within about a minute.
He had a special pole with a carpet covered T at the top to help get the old rail down safely and raise the new one. He ran all the lines quickly and efficiently. Lines that were too long were wrapped around a screwdriver to form a pigtail and efficiently run them with some tension the right length.
I think it was done in ~ 20 minutes and worked right the first time.
Simply amazing to see sometime who has done it before and really knows what they're doing. Made me question every install I would ever do after that.
They did the same thing with a garbage disposal install a year or two later. ba-da-boom, done.