Yep, once you get away from the big dog Garmin (which comes with its own problems and cost), the whole world of devices are pretty much all over the map (not in terms of where they are made, pretty much all out of China). I read the 3 and 4 star reviews, that usually tells me what I'm actually going to experience. The 2,1 are a combo of not knowing, or not understanding while the 5's are cheerleaders. I liked both the Bryton and the IGPS products. I liked the BT data sync with the app that IGPS had, but the Bryton displays looked better. I don't recall which unit it was, but there are some that rely on your phones GPS since the unit doesn't actually have its own GPS...I'd stay clear of those. I think the only reason i went with the IGPS, was that I got turned off by the 'you can get caller ID on the bryton'...I'm riding, I could give an absolute zero about a phone call.

I did receive a bad unit from IGPS, it worked, just during manufacturing there was a wrinkle in a piece of plastic under the glass between the glass and LCD. Wasn't a big deal, Amazon replaced it instantly...I could have paid around 50-60% less going on eBay and getting the unit direct, but that exchange alone was worth the extra dollars. I will admit, I did buy the cadence sensor off eBay, that I just couldn't see spending $35 when I could get it for $14.

I also have an alternative strategy, I bought the white one...once my wife saw my computer she immediately wants one (she likes the fact it matches her bike). So, I get the luxury of trying the IGPS out before I gift it to her and then I get to have fun trying to figure out what I missed with the 50E and get to re-decide if stepping up a model or changing manufacturers is going to benefit me. I'm still OK with the 50E, but the cool color displays have me interested but I know battery life usually will suffer.

As far as speed sensors, yeah if your GPS drops out due to whatever conditions (pretty rare but it happens) and its true the update lag is noticeable (as it also would be with a phone), the speed sensor would be a plus (and again only $14 on eBay). Probably worth the $$ if you are serious about speeds.