Yes, the GSM module is the one we use the most. Our gates take about 10 seconds to open which is not really a long time, but this method means there is no waiting.
The switches I used are similar to this one http://www.rapidonline.com/Electronic-C ... 94cc4854c3
They have been installed for about 3 years now and have never been a problem even when exposed to extreme weather.
I have used Visonic devices extensively over the last few years for a number of reasons. Firstly, they have been 100% reliable for me. They seem to have a very good battery life, range is very good and they are so easy to interface into Homeseer via RFXCOM. There are a couple of downsides, one of which is that the PIR sensors are not really any good for anything other than security. The reason is that they have about a 3 minute reset time after being triggered. This means that they are not really good for triggering lighting events etc. I have tried numerous external PIR sensors over the years with variable levels of success, but about a year ago I installed 3 Visonic Tower MCW external PIR's and I must say that I am very impressed with them. I can't remember having any false triggers on these sensors.
I don't really do anything fancy with the MCT-100's other than returning the status of various devices into Homeseer. I have created an alarm system for my motorhome that uses an MCT-100 to communicate with Homeseer when the vehicle is parked at home. This also notifies Homeseer (via the MCT-100's second channel of a low battery status and automatically switches the mains power on to the vehicle for 24 hours to charge the battery.
Aslo a little off topic:
I have played with automation for a few years and my biggest gripe (along with many others) has been the lack of affordable, easy to retro-fit devices with 2-way communication. I have recently been experimenting with some Jeenodes to replace some of my non-security Visonic devices and the gate status is one of the projects that I will likely switch over to Jeenode. My main reason for this is the 2-way communication.
I am also a new starter on the Z-wave scene. Finally there are some European devices coming to market, so I recently took the plunge and changed some lighting devices from Home Easy (KaKu) to Z-Wave. Assuming the 10 or so modules I am testing prove reliable, then it is very likely that I will switch over all my lighting control to Z-Wave.
Whilst I enjoy tinkering around with a bit of script writing and hardware devices, I do like things to be reliable and not intrusive visually. As an example: I got fed up trying to find a good solution to my heating control that could interface to Homeseer, so 2 years ago I purchased the Honeywell Homtronic manager and 16 HR80 radiator valves. A very expensive choice and only limited integration to Homeseer via an IO module that allows me to set a given lifestyle but it gives me individual room control and the system just works. Again, it has been 100% reliable.