Descender -- Petzl - I'D - 1/2"

I've been cleaning windows for over 30 years. I still do chair work at least half the time. I also am fairly large at over 250 lbs. I decided to try this because I have seen descenders come untied while someone was working, and recently had it happen to me twice on the same job. Once I was stuck and had to get help, how embarrassing? It is very easy to use. I've found features like taking up the rope in the climbing mode very useful when working on balconies and ledges. I do not like having to use 2 hands to descend because if my rope grab isn't dropping on it's own I have to keep stopping and moving the grab down. This waste a lot of time and I have not yet figured out how to work the rope grab I have and manipulate the grab. There might be a way but I haven't found it. I do not like the panic stop, it's too easy to set it while free falling. I guess I have to purchasing the the petzl ASAP even though it is expensive because I actually prefer using this descender.