I LOVE the Sigma BC2006 MHR. It's wireless. It's also MUCH more accurate than the Trek Incite ACH digital I'm forced to use until I get a new sensor (read below). For every 10 miles, it reads .4ths of a mile SHORT which means it raeds my speed slower and averages slower than normal, inluding mileage. Also the altitude feature reads much higher than my Sigma (ie: not realistic). The Sigma is actually quite accurate and reads several functions on the screen at once instead of having to cycle through each individual section. It reads all the regular distance, speed, averages etc and also includes altitude info and a heart rate monitor. You can find them for less than $100 several places online. The O-rings do stink though. I ended up destroying the speed sensor because it shifted slightly and contacted the magnet and was destroyed (I was doing over 30 mph when it happened). You can set it up where you need it with the o-rings around the fork and then put electrical tape around the o-ring to keep the sensor from moving around. I did that but still had a problem. I'm going to silicone my new sensor to my fork in the proper position, then use the o-rings AND then electrical tape over them. Hopefully I won't have anymore problems!