Like you, I prefer hiking at my own pace and it happens to be a slower pace than most of my [younger] hiking companions. It stresses me out to have people wait for me to catch up. It gives them a break, but, as soon as I catch up, we're off and running again! <img src="/forums/images/graemlins/frown.gif" alt="" /> But, also like you, I really prefer hiking alone most of the time.
The PLB is a great idea and I've been toying with getting one, although I'm reluctant to add the extra weight. How much does yours weigh?