I have experience with the Surefire X200, the Streamlight TLR-1 and TLR-3

X200: very high quality, not quite as bright as the latest Streamlight offering (the X200 is an older light). I like the fact that if you push the rocker in any direction it locks on, and if you push it foreward it is like pressing the tailcap on a conventional light (instant on, instant off). My only gripe is the price and the fact that the mount seems a little tight on the M&P frame. I imagine that the current generation Surefire lights are brighter and may mount slightly better on the M&P (it looks like the switch just presses hard against the trigger guard- it does not affect function, but it can be a bugger to get on and off).

TLR-1: very good light for the money. Much cheaper than the Surefires, and brighter than my X200. A lot of my guys at work have them on their guns, and I have yet to see one fail. My only complaint is that the rocker switch is constant-on one way, and instant-on the other. If that works for you, great...but if you want it the opposite way, I'm not sure you can reverse it.

TLR-3: small and bright. It is much smaller than the TLR-1, and still bright enough for serious use. I like it because it doesn't stick out beyond the barrel and is narrow, so concealing it is a LOT easier than concealing a TLR-1 or any of the Surefires. The rocker switch works the same way as the TLR-1.

Mike

I use the Surefire X300.  The operation is exactly the same as the 200 but its brighter.  You can get it in a flood or stream light.  I have the stream because I search outside a lot with it.  For interior stuff the flood will do better.  Not sure of the prices not but the Magic Box can answer questions like that.

I would strongly suggest that anyone that is in the market for a "firearm mounted light" get one that has a STROBE feature.

The power of the strobe is probably one of the very best kept secrets in the low-light fighting world.  When one uses a strobe - for real - it is an amazing and astounding experience - even after repeated use in the same type of scenario.  The effect a strobe has on humans is like a prolonged FLASH BANG.  It disorients and disables potential aggressors and turns them into a shrinking mass of flesh and bone.

This was borne out to us on nearly every entry we did on a fugitive - and whoever else was in the room too (and sometimes the *other* people in the room were much scarier than the fugitive we were after).

We words "POWER OF THE STROBE" entered our vocabulary.  It must be SEEN to be appreciated.

I run the Insight Technology WX150 lights on all my 'go to' guns.  They can be had brand new for around $120.00.

cheers

tire iron

The new Streamlight TLR-1s has the strobe feature.  

$98 at LA Police Gear currently

 I bought one of those from LA Police Gear a little while back, great light. You can find coupon codes that will drive the cost down a little more. I ended up paying about $90.00 with free shipping. Regarding the strobe feature, I agree with T.I., it's nice to have. Tested it on a friend (cleared and safe XD-9) in low/no light, then I had it done to me. Oh boy, it works. Reminded me of going to a club and suddenly being disoriented by a strobe light. Except this strobe was like looking into the sun...
 

(Well, that or the -3, depending on whether you were looking at CCW or not)