It's disappointing that DDR4 isn't compatible so you are forced to get the more expensive choice.
It's disappointing for me that they fluked the DDR5 standard so much. Motherboards are losing I/O as are laptops, integrated OEM PC's, mini desktops, etc. Everything is getting more integrated.
And then they dump on you, huge dimms, bigger than M.2 ssd's who take a lot of real estate with no real benefit other than theoretical density over the smaller laptop sticks, density hasn't been a problem since DDR2. Dimm size is unchanged since DDR1 at least, and it's not like it's due to compatibility.
IMO, the server dimms with code correcting stuff should still exist but normal motherboards and cpu's should migrate to laptop memory size (the upgrade market is sadly shrinking in the first place) and those dimms this gen should have been LPDDR5 instead of ddr5. If they really wanted huge dimms then make it standard the spacing between slots so you can buy an optional "dual dimm" or something. With the space of two dimms on a ITX motherboard you could put 4 dimms, what's not to like.
LPDDR5 uses less energy than DDR5 (so better for laptops going forward as well as mini pcs - but sadly this means soldered which is a nice excuse for companies like Apple to take serviceability away from customer), and this gen would most likely be cheaper because it skips the ECC chip that is making DDR5 expensive in the first place. LPDDR is the future for home computing so I want LPDDR on a stick.
TLDR; Server DDR5 and LPDDR5, they should have done away with the standard DDR5 memory as well as the big form factory that it commands. It only creates further market segmentation. And the ECC component should have been skipped or made optional. It's a great option to have, ECC, but not at the cost of a memory increase for everyone.