Genghis is right about the CAA approval. The guy at the ICOM stand at Kemble confirmed that they had no intention of seeking UK approval for the reasons stated.
But they work very well, and there's always one in the bottom of my flight bag for emergencies.
If I remember rightly, it was $300 at Oshkosh, with $30 cashback and free alkaline battery pack and headset adaptor.
I've also seen them for sale at Dubai airport at a similar price.
I've never used the record function, a bit too fiddly to be of practical use I think.