I got Adec Marine jackets in the LBS, a few years ago. Manual. 2 reasons for upgrading,
1, I found the seam on the inside of the neck on cheaper jackets was a real pain in the neck - literally. by changing to a seam on the outside it saved a few rashes for the not so tuff guys on board

and made wearing them easier.
2, I had 4 auto jackets and had them inflate in wet weather whilst in storage, It was my fault they got so wet but it was a real pain and the cartridges on cheaper jackets were hard to find. Whereas the Adec are 'reasonable' good quality and used heavily by the media industry/commercial etc. (and their HQ was in Croydon which was handy for the guarentee).
Im sure there are others better but on a boat show walk around I found them best in show at the price over sailor brands.