Well, realistically, all alarms are a deterrent to one extent or another. Any determined thief will overcome any security measures you might put in place. Just look at what happened at Hatton Garden. I want something to let any potential burglar know that he is not welcome once he's inside, and he needs to go quick, and send me a message so i'm aware that the alarm has gone off.
My budget - maybe 300 pounds - but if it takes 500 pounds and ticks all the boxes (plus some I may not have thought of) then so be it. I didn't say I wanted a rubbish system - I just pointed out that the ones i've seen with integral GSM appear to be rubbish. I'm hoping some kind person here might be able to point me to a system which is not rubbish (or less rubbish) at my price point with the features I want. If it is not possible - what is the price point for such features?
The Texecom premier appears to have some of the features I need, albeit with addons, - though reading through past posts here, some people hate them
Thanks!