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I have had the Varia for a couple of years. The light works fine and the radar works great with my Garmin 1030. The best/safest solution is to use the Varia with a bike mirror: one warns you to watch and by watching you can take evasive action if needed. If I were just starting out riding on the roads I would pair the Varia RTL515 to my phone and use a mirror while riding.
My son says this is all rationalization for buying the Varia RTL515 because riding on the road is crazy and to think my 73 yr old "catlike" reflexes will save me from being hit is a fantasy. But hey, I am a believer.
I use my Garmin Edge 530 for all outdoor cycling activities (8-10K miles/year) and use the HRM for both outdoor and indoor 'rides' (on Zwift). The transmitters are good for 2-3 years with 1-2 battery replacements... then it's time for the strap/transmitter replacement. This time, I bought 2 because my wife's Bontrager HRM gave up the ghost at the same time, and the price was great.
I'd been eyeing this for a few years. Background: When I ride on really cold days (30s-40s) I need to wear double gloves to keep my hands warm. So the Garmin touch screen doesn't work all that well. Some of my gloves won't work the screen even with a single layer.
So I asked for this remote for Christmas. Got a chance to try it last weekend, and it just WORKS. No fuss, easy pairing, click the button and the screen pages.
Also useful on those super-steep loose gravel grunt-up-it hills I have in my nbd. Don't really want to take my hands off the bars, but I might want to page to my heartrate or power output. Easy to do with this remote. Kinda pricey, but it does what it's designed to do.
I got this when I saw a sale pop up. I needed a new blinky for my bikes and was toying with a cheapo radar model, but this was reasonable with the sale.
So as a light, it's great. Very bright, has different modes like they all do, etc. All of the boxes are ticked there.
The radar component is a gamechanger. You don't realize how much goes on behind you, and this thing lets you know how many cars are coming, which is a great feature. Knowing one is pretty good, but however it figures out that there are 3 or 4 coming, awesome data to have.
One thing you probably never thought of is using it in a time trial race. If you want to hug the yellow line and corner faster, you can drift over and take better lines because you know the road is clear (take a quick peak just to be sure).
The one hiccup I've found is if a car is going the same speed as you. The car seemingly turns off, but it didn't, it's just not registering with the radar. You'll either get no dot back, or it'll keep coming and going and drive you nuts. So, like previous paragraph, you still have to check, you can't just rely on the beeps and dots.
Battery life seems fine, never had an issue, I do wish it had a USB-C rather than the silly Micro-USB plug. I've also had it hit with spray from my back tire in many rain storms and it is still going strong.
Easy to pair with your head unit too. No issues.
If you have more than one bike, find some mounts so you can share it around, I tried going without it, and it just feels wrong.