I've been looking for an in-ear thermometer for a long time now and now my second child has been born I thought it was a worthy investment (she's 2 months old now).
The Braun seem to have the top ratings on reviews and are the ones used by doctors/nurses etc in hospitals. Also a friend has one of these and highly recommends it. This one is the latest model I believe which has a nice red/amber/green indicator.
Seems to be the cheapest price around too - Amazon lowest price to date has been £35.20 (a few weeks ago - i missed it then) but is currently trading at over £50. Advantage points only with Boots mean you get another £1.36 in points for use at a later date.
Hope this helps someone.