I've got the "new" transmitter. My experience is that battery life on the transmitter is horrible. Start getting low battery warnings after 20 dives or so. The longer time progresses, the more disconnects. They're only temporary, but the problem of intermittent connectivity issues has definitely not been solved by the new transmitter. Mine is just over a year old.. maybe 18 months. A week or two ago I changed the transmitter battery for the fourth time.
If the older ones were worse, that explains some of the animosity I see on this site regarding hoseless air integration.
As for the irda, I got a $20 USB irda adapter on amazon. The IRDA computer integration is a bright point for galileo in my opinion. Not only are dive log downloads easy and reliable (compared to other computers like petrel) but you can fully configure the computer's settings via PC using the IRDA.