The ONLY motion lights I've tried that are any good are those Heath-Zennith motion detecting lights you get at Home Depot. We only used them so far for replacing the outdoor lights on the house. I got the 280 degree sensing for each flat surface. You can get 360 degree too. But anyway, that thing'll snap on as soon as you walk around the side of the house. My husband has installed a few for friends and family and every other brand was total junk!
So we have four of those installed on the side and back. Basically, they're flood lights and very bright. Great motion sensing. There is one that is in a fairly shady area off the back porch that occasionally does not work. The customer support was very good and they sent me a little attachment with some instructions on how to deal with it. The thing is on real overcast days in winter, it doesn't get enough ambient light to reset itself sometimes. I may have to put some dark duct tape over the attachment for over night so it gets a reset from day to night change of light. Anyway, a couple days of the year it's a little flakey but it mostly fixes itself. Other than that, all work almost too well.
Now I've had these things a good 5-6 years now at least. They are halogen and I think I've replaced maybe one of the halogen lamps one time in all that time. The one that gets used the most.
I did use some lower light decorative motion sensing lights up front. They are okay but they are just for walking up to the front door. They are not the Heath Zennith. As far as floods though, Heath-Zennith, don't get anything else!