A bought a Secumar Ultra AX Plus
(or was it the harness?) having trawled round many stores at London boatshow and asked a senior RNLI chappy for some (unofficial) advice. I had never heard of them either...
What drew me to Secumar stand was its auto/manual configuration option (I was looking for a lifejacket with built in buoyancy plus manual topup and when I found the limited selection they were far too bulky so rules that type out) but after having tried it on and setting it off, I liked how comfortable it was and how well it fitted when inflated.
In use, I don't even know that I am wearing it although ironically have not yet bothered with manual configuration since I bought it.
They also do a slightly cheaper one without the hood, light and harness. Both models come with a crutch strap as mentioned in the video above.
In tests it performs very well as do most life jackets - I think the only criticism is it taking a second or two longer to inflate than some others but I see this as a plus as its less likely to accidentally fire in spray.
I thought it very good value for money, very well made (I found comparing fastening clips between so makes/models quite interesting) and the rearming kit not ridiculously priced.
My only criticism is that I wished it had an external pocket to hold my VHF although, in reality, the harness clip is easily accessible that I clip it on that.
I think it was the one demoed in the above video.