I just had HIFU 3 weeks ago (one 9mm lesion but spanning left and right, Gleason 4+3, PSA 5.84). I chose this option primarily because I'm fairly youngish at 56, fit & healthy and also for the potential lessor side effects.
The procedure was pretty straight forward, stayed overnight at the hospital and then had 8 days at home with the catheter in.
Three weeks down the track it's so far so good, no pain, minor swelling, no incontinence and working as before down below...urination and erections normal ...although there's been blood in my semen.
Though the proof if it's worked will be in 3 months time. Good luck with whatever treatment you choose.