No regrets at all with my 2.5 Teraflex spacer lift. Some overachievers on the forum will scold and say otherwise.
Been on all type of terrain, been doing a lot of rock out here since moving here to Utah and have not had any problems. As other Jeep prophets had warned, that "spacers will fall out during max articulation".......ain't happened yet.
If you want to keep your stock coils and maintain factory ride, spacers are a great option.
I just bought some 17/59 JKU springs for $69 to see if I can get an extra inch or so of lift with the existing spacers.
Personally I don't have a big bag of money to toss into expensive modifications (wish I did) so I like to go with what works at a reasonable $$.