they are about the same price now... but have gone up, I paid 49 quid for mine and it came with a pcl tyre pressure gauge (pen type) and 48hr courier.
they now seem to be 59 quid
I'm sure they were around £50 when I lasted looked. Push on is simple and can't go wrong but I can see the benefit of a clip on for stuff with inner tubes. I'll have to get one of each in digital and analogue