Touchwood I've had one false alarm with my Pyronix Enforcer and that was down to a failing battery in a sensor that I dismissed because it wasn't long after I'd fitted it (turned out the best before date of the battery was 3 months prior to me fitting it). The WiFi side of things is great, can see the state of it from my phone and set it if I forgot. But price wise they aren't cheap.
If I was going wireless I'd use Visonic or Pyronix. If it's wireless and meant for DIY installers I'd steer clear.
For wired, I'd probably go with an Acenta or Optima (by Honeywell ADE I believe). They do have some communication options as add on boards but I don't believe it's anywhere near as full functional as say the Pyronix stuff (I can reprogram the panel over the internet if I so desire and perform all sorts of maintenance tasks).
This is all based on my personal experiences with these systems. I've found both the Pyronix and the Acenta/Optima systems to be dead easy to work on. The Pyronix menus take a bit of getting used to, but once you get the hang of navigation it's pretty straight forward.