The only issue with them, is if the most fragile piece of the charging system is inside the alt, (the hottest, shakiest/nastiest location) and it fails, insteada just undoing 2 wires, 2screws and replacing the $15 reg on the firewall, - you'll have to remove alt to replace the ($$ ?) reg that's inside, - if you have the tools and knowledge, if not, you gotta take it somewhere to get it repaired which won't happen right away .
You know it'll fail the nite before/day of an event, so needing it now, means a whole new big $$$ alternator R&R, steada the regulator on the firewall.
jmo