When I was remodeling my house last year I looked at the T24 to enhance my existing Siedle Vario setup at the front gate.
Combining the T24 with some nice accessories would create (for me) the ideal & professional setup:
MX2Wire to create ethernet connection on the existing analogue wires already dug in from gate/T24 to my house
EXTIO for easy hook-up to lights, (and presumably Homeseer), etc..
However, I was taken aback by the steep price. Anywhere between EUR 800 and EUR 1200,- depending on configuration and what Siedle stuff you already have.
Was too much for my budget.
At that time (early 2011) I couldn't find any suitable alternative. Someday when the "remodeling piggy bank" is filled up again, I will definitely get it.