I actually just bought the zagg hdx. It was buy one get one free too.
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If you haven't installed it yet do use the Zagg supplied plastic wedge to hold the hdx on the screen when you're removing the top (non-adhesive side) film protector (film protector for the hdx). This is after you've installed the hdx on the phone's screen. Run the wedge up the screen as you very carefully pull that film protector off. On mine removing that top film protector removed the hdx from the phones screen botching my installation. Zagg has shipped me a replacement which I haven't yet received. Other than the botched install I'm satisfied with the hdx.
It is a compromise because it's not nearly as hard as a 9h tempered glass protector but it does protect the screen, has IMO excellent clarity & installs w/o a halo. I only have to clean it every couple of days vs. the iCarez glass that I had to clean multiple times per day.
One other tip is to install it in your bathroom w/ the shower running on hot. The humidity keeps the dust in the air down. Don't know how familiar you are with installing screen protectors, dust adhering to the adhesive side of the protector is the biggest problem during an install because it has to be removed otherwise the screen won't lay flat on the glass & it's visually very noticeable not to mention a pain to remove. You can't use your fingers because if you did you'd have your fingerprint permanently showing on the adhesive side of the screen protector. Probably the best thing to use is mildly adhesive stickers, one on the top to lift the protector & one on the adhesive side to remove the dust particle. iCarez supplies adhesive dust removal stickers w/ their glass protector and every protector manufacturer should.
To me installing screen protectors is a huge PITA & w/ the N4's 2.5 glass screen you have to get the side to side alignment perfect otherwise you'll end up w/ a halo on the side that's too far off the flat portion of the screen & exposed protector adhesive that will attract dirt that can't be removed.
I've yet to read about any benefit to the 2.5 glass other than a post on xda forums guessing it was for using the VR accessories. Don't know if that's true or not but I do know that 2.5 glass has made it nearly impossible for any manufacturer to offer a 9h glass protector that installs w/o a halo including Zagg. The hdx installs w/o a halo but their 9h tempered glass one does not.