I use a wireless computer, live in the city, and yes I'm plagued by interferance on almost every ride. The only thing affected is my max speed which reads 74.9 most of the time. For $10? And I can easily swich it between bikes? Yeh, I can live with that.


P.S. I think indexing is overrated.
P.P.S. The max speed spike seams to be so brief that even though it jumps to a very high speed it doesn't affect my average speed, which I do tend to be interested in.