Im a huge fan of the EXPs.... WARNING!!!....they are extremely bright, but hit a sweet spot after about 2 days and last for a good 2-3 weeks and Im a heavy player.
These really work well on darker sounding guitars like Mahogany or Jumbo sizes.
On a side note, Ibanez puts these on all of their new acoustics, so I have lots of people freaking out about how a $200 Ibanez can sound brighter/better than a mid range quitar thats $600.
Bottom line? If you like coated stings or bright strings, but ya dont want to spend $20 on elixers.... you might want to try em!