I think you will find that anyone that has an automatic door loves them. Any reputable door will have proponents, as there's little difference in operation, other than as stated by KJF.
That said, I have the pullet-shut also. Have had it since April, with nary a problem (well, one, but it was my fault). It was extremely easy to install, only had to cut a hole, drill 4 holes for the bolts, and screw it in, attach the motor to the wall, the solar panel to the roof and the light sensor. Was basically a plug-n-play. I think most of them are plug-n-plays. I found the customer service to be excellent. I love not having to remember to open/shut the door (I'm old and the memory goes first). I used the pullet-shut, because I didn't have enough 'upward' clearance on my coop to have a door that raised up and down.
You have the option for having it either on a timer or a light sensor. The light sensor is great because you don't have to reset it like you would a timer during changing seasons as day lengths change. My girls are always in the coop something around 1/2 hour before the door closes, so never a locked out bird. They have a feature where the door closes, then within a minute re-opens for a short period of time in case of 'late arrivals'. Seems pretty stupid to me, as that assumes 'late arrivals' are gonna be within a minute of the close, but it doesn't hurt anything. Just an unneeded feature.
Like KJF said, there are many threads on this. If you don't get many responses here, go looking for them and you'll get pretty much all the info you want. Maybe you or your fiance are not electrically/mechanically challenged like I am and would like to build one. I have seen them made with garage door openers, drapery pull motors, etc.