I've the Dinotte front, very compact, good run times and light - illuminates a drak country road perfectly.
I have heard that the rear ones are so powerful that they must be only pointed downwards and that other riders in a group complain of being dazzled! If there isn't a photo above imagine the ground to the rear of the bike bathed in a very large pool of red light!
For what it's worth I use several (dfferent brand) rear lights at once (it can be hard to see if you rear light goes off when you're riding), some on constant and some on flashing. If you regularly swop the light between bikes the WiteLite is very convenient. The tiny BackUpz (loving all this spelling!) are also very handy as a spare light to keep with you just in case or in addition to your main lights (I keep one in my commuting bag just in case and another in my drawer at the office for the same reason (although the latter is of precious little use when you are actually out on the road).