Compared to Whelen?
I can't answer this. I've never dealt with installing Whelen lights, but know they have a good reputation. We have them on the military jets I fly and they are very reliable and others have said the same. The Whelen's seem to have a better reputation than the Aeroflash lights (which is the system I was going to use originally).
That being said, I definitely wanted to go with an LED system, but wanted to keep my costs down. The Whelens were about twice as much (or more) and I only plan on night flying in my RV-4 as a last resort. My main goal is just to increase my visibility (to others) while flying.
For me, I was willing to take the risk of maybe going lower quality for the drastic price reduction. Not to say they're lower quality, but I figure if they are, I can deal with it for the huge price difference. I know LED lights are very realiable in general, so if the power pack is okay, it should be a very good lighting system.
Hope this helps . . .
Rick