I just recently received my Auber RDK-300, their 20mm coil, and I use it with a CCA 710 Liger 2.0 with SiC insert.
So far I think it works like a champ. Yes, it takes a bit of time to close the final range to set point...that is, the rate of temp increase seems to continue to slow as it approaches set point...but I don't mind that as with a big Ti banger I think its just fine to let it all sit there and heat soak and reach equilibrium.
I don't have a k-type thermometer so I don't know how close coil temp shown is to actual dab surface temp, but having looked over a number of controllers miserable excuse for documentation I'm impressed with Auber's description of how to set the temp correction coefficient and their assertion that 1.03 is the right setting for a 20mm coil (versus default of 1.0). This gives me confidence that they know what they are talking about and have test data to back it up.
I have been running the Liger 2.0 SiC at 600 F but may try to ease up or down a bit but must say its working well at this temp.
I also have a cheap Chinese controller that came with a very good Omron E5CC PID assembly. This one took some help from a friend to completely rewire it and get it working correctly. It works great now, but I would never recommend them unless you were true DIY home build junkie who likes to tinker.
I liked Auber very much. I like that they are an instrument company first and just pointed their instrument product line at a dabbing use case. Their documentation and website seems to reflect this solid industrial tech company frame of mind.
I also like that they are in Georgia and if you want your unit to heat up faster you can actually talk to someone in tech support as
@MileHighLife did. Try that with a company in Shenzhen.
I'm sure you can get these qualities elsewhere...but I believe for a lot more money.
Thanks to this thread (along with several others) im convinced that the Auber RDK-300 would be the best choice for me. I have to ask something though; Does the coil make a huge difference? Should i get a coil from Dnail, or is the one Auber provides just as good?
I bought one from Auber. If you have more confidence in D-nail and don't mind spending more money, then do so and all will be well. Auber uses the same coil pin outs that D-nail and which has seemed to become the industry standard (pins 1 & 2 = AC Power +/-, pins 3 & 4 = coil thermocouple +/-, pin 5 = ground. Auber publishes this in their manuals.
http://auberins.com/images/Manual/RDK-300.pdf
http://auberins.com/images/Manual/RDK-300_supplementary.pdf
Best of luck