It's cheap enough to try out I guess, personally I would rip the panel out at this stage
But like I said cheap enough to giv. It a go, experiment with door contact , you have one already?
Ok depending on how it's setup it's quite expensive via the tap service, granted its only per call or sms which I think via open tap is 50p per sms
If they using older o2 or vodaphone centre numbers they are not always reliable
I would have thought in that price there was at least a dialler of sorts or and stand alone gsm unit
Is that the full detailed quote as it doesn't mention monitoring, I missed it speed reading maybe
Have to disagree about mentally taxing , electrical more Labour intensive , alarms if you knew what some these guys here do with linking systems together and so on you will soon think it's a bit more techinal than you think
Unless you stick to basic systems like me, and don't want the xtra headache