Back before DS (Detection Systems) was purchased by Bosch, DS bought Radionics. Some of the Engineers didn't like the change and went to work for DMP. Just after that (cira 1998) DMP came out with all kinds of module that used addressable Radionics Poppit modules, and kits to retro a DMP board into a Radionics enclosure....ect Hmmmmm.....very coincidental, several lawsuits insued. DMP tried to make their own Poppit version (711) which for lack of a better term, still suck! Since then most Radionics/Bosch Dealers really don't like DMP.
DMP is associated somehow with Atlas Alarm based somewhere out of Missouri.
(P.S. I installed that @#$%& for a dealer a few years ago, the company that bought him is still replacing it out and starting a lucritive boat anchor division.)
As far as the Bosch/Radionics comments go, to each his own. I've found the Radionics product very dependable and durable if correctly installed. Their primarily market is geared towards commercial and industrial applications, not residential. Next time you goto the biggest retailer in the world AKA Walmart check out the Radionics keypads on the wall.
Most dealer with a conscience will give you the lock code or unlock the panel for you by request. You paid for it, you should be able to choose your service provider, unless they have you locked into a 5yr monitoring contract, even then you can pay the penalty and use whomever you want to.