This seems like it will be a fine light.
The only problem I have had so far is that the light reflecting off the reflecty signs is blinding.

Flash (super rave) mode is probably only usable at twilight or daytime.

I just got a Niterider MiNewt 600. It's nice and small yet very bright.
It lights up at mid power when you turn it on. Then cycles to high, low, mid, high, etc.
On brightly lit city streets, I use it on low power as a be seen by light as I can already see the streets.
I use it on low on the Greenway as well. I can see enough and don't want to blind other riders.
On poorly lit secondary streets I usually use it on low, sometimes medium or high if I really need to light up the road.
The mount was a little flakey. I closed it using pliers and zip tied the clamp shut.
This light is not fantastic, but it works very well for what it is. Small, light, rechargeable via USB.
I like that it is cordless, self contained. Very easy to remove when shopping.
I am very happy with this light. It suits my needs and was not too expensive. Bought it at REI with a 20% discount, $120. It works for me.
Bill.
Edit 11/2/11: Been turning it off on the Greenway as it seems to annoy other riders even on low. I can see on the Greenway without it and have a blinky on my helmet so other riders can see me.

Since my handlebar is thicker in the middle, I usually clip it on on a thinner part, rachet it up and then try to slide it to the center. Works well.

It's plenty bright, probably overkill. If you get carried away with running it on high, you may need to recharge it more often than say, a MiNewt 150.

I came across some people moving a couch at 6:00 am.
I said "Sorry about the bright light". He said to her "I thought it was the cops".

FTFY

I mounted my old minewt 150 on my head.
That with the 600 on my handldbars is double-blinding daylight.
I apologize in advance if I blind you inadvertently.

/robot

That said, I wasn't sure how to do my 150/600 combo. 150 on the helmet or the bike?

For commuting I would say 150 on the helmet. Bright enough to give drivers a little heads up without blinding them, and both lights are in front of you most of the time. For MTB though I would do the brighter on the helmet, that way the most light is where you are looking at any given moment.

Still using my Niterider MiNewt 600 daily. I run it at 400.
Love this light. The switch glows red when I need to recharge it. I can see the road and drivers see me. So glad I bought it.

How do you owners like the mounting system? I really like this light, and its pricepoint, but I feel like that's the weak point of it.

Is it pretty easy to switch between bikes? Lately I haven't been riding the same one two days in a row

While I do love the light, the mounting system is it's weak point. Not the way the light mounts to the handlebar mount, but the way the handlebar mount clamps onto the handlebar.
It's a bit tricky to get it to clamp on tight enough and also to not inadvertently loosen it when you take the light off.
I solved this for myself by tightening it on the handlebars with a channel lock pliers. I made sure all the little nylon teeth were engaged with each other. Then I zip tied the locking tab to the slot below it so it couldn't move.
Did this on two bikes (Yes, i bought a second mounting bracket) and it has worked perfectly for me.
While I've moved this light bike to bike, I have a properly secured mounting bracket on each bike.
I would not move the mounting bracket between bikes. It's too hard to secure, IMO.
Sad Niterider didn't make a better mount. But you can make it work. And it really is a great light. Well worth the mounting bracket hassle IMO.
Bill.

Agreed. I love mine. I really like being able to get to work, pop it off and plug it in to my the USB on my computer. It's always charged.

My feelings about the mount are the same as already stated.

If I had to buy it all over, I would.

Thanks for the reviews guys. I have been wanting something better than my flashlight/twofish lockblock combo I use for my midnight commute home, and with my REI dividend and the 20% off, plus free shipping, I got it for under a hundred bucks to my door.

And thanks for the idea about the zip-tying the mount. I'll probably just buy and extra mount and have one on each bike set semi-permanently.

Holy crap guys. I just got mine and the thing is ridiculously bright on low. I think it will be overkill on the Greenway, but it'll be nice to see so much more than my little flashlight allows me to see.

I am pretty impressed with it so farand do the zip-tie trick to keep it steady or use the helmet mount.