Interesting comments.
Chaywesley, I think this is a case where I would order from an authorized dealer. This is no criticism of amazon. I just think in this particular case I would prefer ordering from a dealer who did not carry half the world's products. Yes, I agree with you. the "2019 TT-50” should have had a new product designation.
Josu, the problem with the older TT-50 is that some of them chatter. Like you, I have never experienced this. Ionut, a very experienced Tormek user, had the problem and corrected it with a couple plastic electrical ties. The fix is fast, easy, and efficient. I have both versions. My logical side tells me the newer design is less likely to cause trouble. I have generally switched to using it. However, if I misplaced it, I would be just as happy using my older version.
I would consider purchasing a new older design TT-50 or ADV-50D, but only if it was priced at substantially less than $50 US, the cost of a replacement diamond cluster. (They are usually priced, overpriced in my opinion, much higher than that.)
Ega, sadly, Allan Holtham has retired. I have always found his videos both informative and enjoyable. I consider his in depth video on the DBS-22 drill bit jig along with Jeff Farris' outstanding turning tool sharpening DVD to be Tormek's finest videos by a wide margin. Alan did a great job for Tormek. I hope Tormek will find a worthy successor.
Ken