on the '09 SERG;
'Having had a crank replaced at 10k, and a lifter go out and take out the whole motor at 22k, for me the upgrade lifters are the inexpensive way to go (if you can get away from the "may as well, while we're in there")
It made fiscal sense for me ("while we were in there") to Build the motor to 117 with "all the goodies" and S&S Premium Lifters, also, we will be doing Cam Chest inspections every 15-20k (barring any issues)...
The '05 SEEG;
'Upgraded the Cam Tensioners (preventative). Bike has been drama free...
The '81 FXWG Shovel;
'Had lifter issues (even back then) the "fix" was to replace with solid lifters. "While I was in there" I installed the 470 Sifton Solid Lift Cam