Over a year
Recently: Audiotechnica AT 820 (still in use, but older model, which has seriously changed ), Rode NT4, not to mention pairs
Very very good output level, outstanding "return air", Separations of L/R not too defined, excellent and impressive ability to separate planes (close, distant). Great maneuverability (size and weight, used in micro camera and comes with XLR / XLR and XLR-minijack).
Much less sensitive to wind than NT4 (which is terrible on this point) and handling noise.
With windshield, handle, and Rode PG2 (Dead Kitten) it is a truly formidable all-terrain tool!
Inexpensive, but compares well to microphones of much higher cost.