Solid protection without the bulk
592138
OtterBox's dual protection without creating bulk is perfect for the RazrM.  The dual tone combination also makes it attractive and unique..
3964043
This is a good compromise case between ruggedness and thickness. It strikes a nice balance between adding protection and adding bulk. The clear back does expose the Nexus/LG branding.
2421238
This case is very slim and doesnt add any bulk to the phone.  The cutouts match exactly with the ports of my Motorola Moto G (3rd Edition).  It fits perfectly around the colored accent piece on the back of the phone, which is important to me.

I ordered the matte finish and was disappointed when it arrived because the front border is a shiny black.  The back of the case is the matte black that I expected.  When I put it on the phone, the shiny front border actually looks good against front panel of the phone, which is black.  That was a pleasant surprise.

The case goes on easily, is not too hard to get off, and won't come off accidentally.  The only drawback I have found is the area around the buttons.  The buttons are open, not covered by the case.  To push the buttons, your finger has to go underneath the lip of the case that goes along the face of the phone.  It isn't quite as effortless to push the buttons as it would be without the case.  The edge above the buttons is also a little abrasive, almost sharp.  It isn't a big deal to me, but some may be bothered by it.

The title of this product includes the phrase, Drop Protection.  I think that is a stretch.  The case is thin and I worry about dropping it.

I wasn't sure what kind of case I wanted so I bought two.  The other is a dual layer shock absorption case.  It definitely offers more protection but also adds too much bulk.  Between the two, I have been using this one much more.  Personally I may look for a case that lies somewhere between the two, more protection than this one, but less bulk than the dual layer case.

If you want a functional case that adds basic protection for your phone that does not add bulk, looks nice, and works well, this is a good case for you.

12/12/2015 UPDATE
I decided to stick with this case since thicker cases detract from the look of the phone.  I've dropped it a few times on tile and once at work where the carpet is thin and on top of concrete.  There has been no damage to the phone.  The case seems to protect better than I expected.

I'm keeping my rating at 4 stars because it is less convenient to push the buttons with this case on.  However, I like the way the phone looks with this case and I recommend it.
2214803
This is my second Otterbox defender case and I'm nothing but pleased with it.  The latest style changes eliminate the fuzzy "echo" issues with the previous generation's cases.  The holster is solid, and while not waterproof is very "Element resistant."  The impact protection is outstanding-my 2 year old daughter was playing a shapes game that uses the accelorometer and ended up chucking my phone across the waiting room and into the wall of the Doctor's office.  Not so much as a hiccup with the phone.

Caveat:  The bottom of this case allows for the OEM sync/charge cable to fit well.  iGo tips, however, will NOT fit without removing your iPhone from the case.  Many aftermarket cables won't fit either due to them being squared off instead of thin & flat like the oem version.  Nothing that can't be mended with a Dremmel and careful sanding, but if you're not comfortable with this or with the inability to use docking stations and generic cables then I'd look for a different protective solution.
-The case does cause "Watermarking" on the screen when installed.  My solution was using a moirrored screen protector in conjunction with the otterbox.  You can also sprinkle baby powder on the inside of the otterbox screen protector to help limit the watermarking.
886065
This is not the case you want if you're looking for drop protection. You can't have both ultra-thin and drop protection at the same time.

This is the case you want for scratch protection while adding almost no bulk whatsoever. It's as close as you can get to a naked device. To put it in perspective, it's a little thicker than a screen protector, but probably not by that much. It's thin enough that they just provide plain cutouts for the buttons, and yet the buttons still extend out from the case a little bit. It is thin enough that I can keep it on and *also* put a Spigen Liquid Crystal case over it, although the buttons become difficult to press in that scenario.

The cutouts are very precise. USB and headphones do connect and work, but they don't seat as firmly as a naked phone, or a case that has more generous cutouts. I am looking at it wondering if I can enlarge the ports with an x-acto using the Spigen case as a template.
3690009
It's a nice sturdy case without being too obnoxiously bulky.  I can slide it into my jean pockets and it's survived a few drops at heights about 3.5-4 feet onto hard surfaces without resulting in phone damage.  The stand was difficult to open the first time, but it pops out now without being loose, and it's occasionally useful.  I like the belt clip and will use it while I'm working, but it seems a little more difficult to snap the phone in than other case combos I've owned.  Overall this is a great value and well worth purchasing.
4900611
After spending days driving myself crazy looking at case reviews I chose this one simply because I seemed to offer the most protection. It's the only one with raised edges on the four corners ensure the screen should never hit the ground and are very thick to provide good shock protection.

The back of the case appears matte black in the pictures, however it is a slightly reflective smooth finish that unfortunately loves fingerprints. The raised buttons are very responsive and in my opinion easier to manipulate than without, as I would always poke the camera thinking it was the power button.

The case is easy to install, and adds some weight. Also due to the corners, it sticks a bit in the pocket but the protection it offers seems incomparable. Coupled it with a Zagg screen protector and I'm confident my phone can take a good hit.
4718271
Very solid case, not too bulky to fit in my pocket, and very reasonable price. I highly recommend this case if you are willing to sacrifice a little bit of mobility for a lot of protection, which is unavoidable in these circumstances. Good quality case.
4228479
I really like the case and would not hesitate to recommend it. It goes on the phone easily. It adds very little bulk to the phone and, best of all, the smooth black case provides a solid, slip-resistant hold on the phone. I have not dropped the phone so I cannot testify to its ability to protect the phone in a fall. One little feature I like is the four little "feet" on the back that ever so slightly raise the back up off any smooth surface it lays on. It helps keep it from slipping and provides some protection for the camera lens. When paired up with the ballistic glass screen protector (available from another seller), it provides really great protection for the phone.
1851336
I hate bulky and/or poorly designed cases. I've tried cases from several companies and Spigen without fail have proven to be the best for me. I want a case that's slim, attractive without taking away from the phones design, adds minimal bulk and protects from minor bumps. I don't tend to drive a tank over my phone, so massive, armored cases just aren't necessary. This case gives me all that and leaves all ports and buttons easily accessible.
2507231
Great thin, protective cover that doesn't add a lot of bulk to the phone.
3248765
My second one of these - great protection, non slip, not too bulky
869997
Nice look and Great protection without a bulky weight. Can't go wrong when Protecting an Investment.
3348347
Slim snug fit. Solid rubber edges.good protection with minimal bulk.
367474
A great case that adds little bulk but plenty of protection. Nothing is blocked, including the laser auto-focus, and plenty of room around the ports. It has a nice feel to as well, not a silicon, dust and lint-collecting case that adds resistance to your pockets. Also, a raised lip around the screen protects it if you place your phone face down.
2105530
A great value. Excellent protection without adding a lot of bulk.  Two minor issues - the power switch is hard to reach, which may or may not be an issue depending on how frequently you use it; and the back of the case is very smooth and slick. I prefer a little more friction on back of my phone cases.
4291111
This protective case is pretty solid and doesn't make the phone ridiculously bulky.  I like that the phone is wrapped in a molded rubber form first to reduce shock, and that seats a durable hard plastic exterior.  All the buttons are raised and press easily.  The ports are covered with rubber flaps to keep dust out, which is extra nice.  The speaker, camera, and infra red port all are perfectly aligned.

I will never buy another brand of phone protector.  Get an OtterBox to protect your phone.