The reserve card costs $550 per year, but I basically got my investment back, even though my SkyClub membership was extended by over 15 months by Delta.
I got 40,000 SkyMiles as a signing bonus, which I value at $400.00, plus I got 30,000 MQMs (15k after spending a nominal amount, and then another 15k after spending over $30k on the card in 2020. I also was able to use the Centurion Club in LAS in mid-March, 2020 for free (a $50 value for holders of cheaper AMEX cards).
The SkyClub individual membership is currently priced at $545/year. So the Reserve Card covers one's SkyClub admission. The gold AMEX I used to have cost $95 per year. So I think the Reserve Card is a good deal.