No one can know all about all brands, I'd say a company can train and support a few well, all less so. Specialise in a few, train and know the products well. Much like cars you wouldn't take your merc to Hyundai garage
assuming its a 50131 system and certificated to g2 then it should of been setup for daily test calls. I'm also assuming you pay your monitoring and maintenance to your installer not the arc?
I have a hkc at home. Full Hybrid panel and rock solid. Also has rf pir camera. But you obviously need an installer that supports it. Other than that id go galaxy (used to have at home) or vanderbilt. But vanderbilt maybe out of budget. Do to the age id upgrade your wired components to probably optex rx40 or hkc quads.
my 2p
i would keep your wiring also. As with grant i wouldn't use either but if i had to choose between those two, id go for the Texecom. Just change the panel to a Texecom that is hybrid
Unfortunately making a profit and surviving seems a bad idea to some. But its the clients that loose out. Sia have just saved a fair few as the installer hadn't paid the monitoring bill for a fair while.
I would think most started up. But people tend to do this on price, ie ill do it cheaper etc which just reduces margin. I knew of a firm that were charging £28 a year for monitoring digi. No longer around
my 2p i don't see why the installer would want to stop you adding devices. It may be new to them etc id ask them to change it. But i don't know Pyronix gear so it may not be possible
amps you seem to infer that people care about security? If that's the case then its also about the backend too. ie not using dropbox for customer data. No data on the google linked phone?
can you upload the log, its seems odd if on extended reporting you got the open as it was ripped off. As above what communicator, arc and polling rate is setup?