Pros: Lightweight. Has worked flawlessly paired with my Wahoo Elemnt. Mount seems to be very secure. Especially useful on rural roads.
Cons: No safety tether but an aftermarket tether can be purchased/attached to the back of the unit. In heavy traffic you will receive constant warnings.
Would I purchase again? Absolutely. I now wonder how I've ridden so long without it even though I use a helmet mounted mirror. Several times the radar detected an approaching vehicle before I noticed it with my mirror.
Just picked one of these up a couple of weeks ago. Used points to knock the price down. But this is a must have item for any cyclist. Whether climbing or descending, you have awareness of cars coming behind you. It has been 100% accurate so far...the only downside i've noticed has been when two cars are too close together (tailgating), the device doesn't always catch it. But considering how much we spend on bikes and equipment, this is the most important safety add-on i've come across. Been riding in Colorado and i feel so much safer. highly recommend.
The RVR315 offers excellent situational awareness. It sees cars you can't see in a mirror - the one approaching from out of the sun or the second, third, fourth, etc. cars in line behind you. It tells you how many cars, how far back, and how fast they are approaching. It announces their presence once they approach within 150 yards. This radar helps you be more aware. And being more aware, you can be both more safe and more courteous to drivers. I won't ride without this pod. Never ever a false all clear. Occasionally, it will give you a false alert - either a BIG cyclist coming up behind you or a road sign oscillating in the wind. But false alerts aren't a big deal.
I previously used the Varia 510 radartaillight but, when riding alone, I always wanted a much brighter taillight than the Varia offers. (I have a Dinotte Quad Red that I use when I'm alone.) When this radar pod became available, I bought it the first day. Now, I get the benefits of Garmin's radar and the brightness of my Dinotte taillight at the same time. Best of both worlds.