What is your intended use? Be seen during daylight or dusk? Or will you be riding at night and need to see the road well as well as be seen?
We don't ride regularly at night, and we have the Ion 100 set on several of our bikes. We like these a lot. Are quite bright enough to be seen well during daylight hours (in flashing mode) and could put into solid mode if we found ourselves out after dark. Wouldn't want to rely on this set to see where I was going if riding regularly at night, though. As far as quality of the Bontrager brand, we have had zero issues with them, they seem well designed and manufactured.
For our bikes which have built-in lights (or just for rear protection during the day), I have recently purchased a few of the Planet Bike Superflash V rear lights. Nice strobing, attention getting pattern with the extra feature that they go solid red when braking. Haven't had these as long as the Bontrager Ion lights, but they are also working so well that I just bought a few more of them.
Both lights seem to go on sale regularly. I may have bought the last Superflash V lights off REI, but I think that they were down to about $25 each when I bought them this week.