Installed a TT31 on my aircraft about a year ago. Perfectly happy with it, especcially the fact that it is fully ADS-B compliant with extended squitter.
I was looking at all the other products and also talked to them (Trigg) before I bought it. It came out best both in terms of cost and in terms of what it offered for the money. So yes, full recommendation from me.
Can't wait until they finally release the ADS-B receiver to show traffic on your GNS 430....