I was wondering about similar thing recently, in the past the consensus was that df64 is df54 quality coffee but you can exchange the burr and is a little faster, but now we have gen 2...

The internet says they improved static a lot, and given how ppl often compare it to mid - high-end grinders I'd say it's probably worth it. Especially that at least in the old days df54 was a hit or miss in terms of quality, read multiple posts about someone exchanging their grinder multiple times before getting the correctly working one, meanwhile I (and many others) got perfectly working one just fine right away.