I've used the Rimfires almost a year now. When I bought mine they were $12 per wheel. ( I think the price has gone up )
The one on my front wheel has gone out a time or two. Not sure why but maybe a problem with the battery contacts. I tweeked the contacts the last time I charged the batteries and had no problems on the last ride. The problem might have been just the batteries being low, not really sure. Other than that they work great and really get you noticed. The only thing I don't like about them is that they are not easy to mount. That means once you got them mounted you really don't want to take they off unless you have to. The battery compartment is just plastic and no telling how long it will last

A while back I saw these mini LED spoke mounted lights ( Atozi Wheel spoke leds ) and thought these might be easier to take on/off your bike. These look a little better than the standard cheap valve cap type leds. The down side is they use button cells but you can buy those by the card ( for a song ) from the Chinese websites. I bought four of the cheaper generic valve stem type lights last year and had nothing but problems with them. That is why I switched to the Rimfires. At least with the Rimfires I can use rechargeable AA's. At some point I will give the Atozi's a try. Would be nice to just slip those on/off my Mountain bike for those short road sections.