thanks for sharing. Never seen that device before, but, of course I'm not an electrician. Myself, being overly safety concious, not necessarily for myself, but more for protection of equipment; I would not leave the 'anti-bucking protection' to that device, but would not fire up and plug in the gen. until I did the manual switching. It is my nature to be skeptical, cynical, etc. I would not depend upon the device to be break before make. I'm sure it has all kinds of testing, safety certificates, etc..but it's just too easy not to take a chance. Re: working on the roof. Go get a safety belt, sling a rope over the roof ridge and tie it off down below on the other side. No questions, just do it!
