I haven't tried an SRP, but I'd expect them to be a nice lake vest... I ride with Lifeline 170, and while it isn't very comfortable on hot days it's one of the few things that I'm confident will do it's job well if called upon... I used to have an ol' "beater" Lifeline 170 that was too small and had a 4" zipper extension... I got curious and put it too the test in My Parent's swimming pool one day for about 20 minutes... I positioned My body in every conceivable position that I cold think of from upside down, face down, sideways in a ball, in a rigid cross, etc. and everything in between several times... I rolled Me face up absolutely every single time, without fail... No one wants to be unconcious in the water and the longer that's the case the worse... As important as the very best jacket is a second boat to close the gap... I trust My jacket for the exact amount of time that it takes My resue boat to drag Me out of the drink...