i cant say anything about logitechs since ive never owned, but as far as klipsch 2.1 reliability, i have had those for i think 4 years now and they still sound great...
it is annoying that the power switch is on the sub (which for me stays on the floor under my desk).
a couple years ago i started having issues with leaving them turned on all the time(like a week straight), the speakers would start emitting this high pitch noise. all it would take was a quick turn off/turn on and it would be fine ...and for the record that happened only sometimes for like 6 months and i havent had an issue since.
i say go klipsch