I have unkind things to say about the small pour tankless I had. Flow was minimal and the thing didn't last long. Got one of the tiny TITAN tanked units from Lowes and it's worked for years.
I have just installed a BendPak HD-7P and while there local installers available, after reading the instructions I decided to put it up myself. The hardest part by far is getting it off the truck. Fortunately, my neighbor has a forklift. The only real heavy lifting I couldn't do by myself was...