I've fished for salmon and steelhead with them and find that I can fish continuously for about 3 days before tiring completely. I haven't done much fishing due to covid, but I did get out last June to the Wye and managed a nice 11lb fish. I've also caught a 20lber in Iceland which was a real tussle on the bamboo. These days, short shooting heads in the 30'-40' head range are used rather than the double tapers, but they may suit your Sharpes more.
![Image](https://i.imgur.com/ZLJI09d.jpg)
BTW I turn 60 this year and don't intend to stop fishing my bamboo speys! They say Alexander Grant fished his 18'-21' greenhearts into his 80's!