I've used Nightrider lights for years and these are an excellent upgrade over my previous set which were the 800100.
The 250 in the back has made me A LOT more confident my light is visible. The previous 100 may have lost a little juice over the last 4-5 years.
The one downside with the lights is that the battery on the 250 doesn't last as long and I usually need to charge it after just about 1.5 hours of use - I'll take that minor inconvenience with being seen though. No issues with the 1200 battery life.
These lights are bright, adjustable, perform for a long time, charge relatively fast. They also get you noticed by motorists and make training rides safer. I have used them in the rain and in fog. Excellent products that are well worth the cost.