This is a no-brainer deal!
Just got myself the Tier 3 and found it one of the more useful and must-have tools in my arsenal.
ElkQR is easy to use, reliable and fancy.
I really like the ability to use mine and my client's website domains to generate a wide range of codes, from business cards to business profiles, to restaurant menus, to apps, to lots of other cool things!
I really like to be able to customize my designs so I don't create boring codes, or 2 exactly the same, and be able to see their metrics.
If you want your clients to impress their clients with digital business cards and fancy QR codes, this is the tool you should get... this is the best buck for the price, this tool pays itself in no time...invest in your business and/or yourself a stack yourself with them!