I bought the SeaGo straps as they seemed the most comfortable - on paper when compared with illustartions from other chandlers.

I have fitted them on our XM lifejackets.
The instructions for fitting are clear and the straps fitted well.

The crotch padding seems to be a bit stff at first but after wearing thyem a few times I tend to forget I have them attached.

They are certainly the easiest to fit and wear especailly with the large buckle attachment

I entirely agree, good value for money, easy to fit on various makes of jacket.