The speculation is “truth”… If you use filament other than Zortrax brand filaments, even ABS versus ZABS, then you run the risk of using a material that lacks quality control in either chemical composition or cross sectional tolerances. One of the big warnings out there is that you cannot control the temperature profile and extrusion settings. This is true and you have to choose which profile: ZABS, ZHIPS, ZULTRAT, etc. when slicing in Zsuite. Many people may find this prohibitive, which I did initially, until I did some research and found some temperature controller kits that trick the machine into printing with any material of the correct size. I personally chose Z-Temp over the other options because it was a quick and easy, snap in-snap out assembly and can be removed without damaging the machine or voiding the warranty. You can even turn off the heated bed for lower temperature filaments.
In terms of this deal, you will take a long time to burn through 56 rolls of filament. Even if you didn’t get an aftermarket kit to use whatever filament you want, you’d still a ridiculous amount of proprietary filament that is priced well for its quality. The main reason I’d recommend a Zortrax is the quality, even if you don’t buy it through this deal. If you’re patient, the printer can churn out professional quality parts with great accuracy. Hell, my printer rivals my company’s Stratasys production 3D printer in terms of intricate details and surface finish.
I’ve also never had to mess with the extruder when using PLA or other non-proprietary materials which is great!
Lastly, if you do purchase a Zortrax printer of any kind and want support from the company in their forums, make sure you are careful what you say because they are quick to delete and censor people who complain (although most that do are clueless about how 3D printers work). Also, never talk about after market products if you want any sort of warranty, but if you’re the least bit technically minded you should be able to fix any issue that arises. They provide spectacular documentation for nearly anything that could go wrong.