I have a 2019 SL 6 and it is a great bike. Couldn't ask for much more really.
But, I got it in my head that I wanted a Di2 bike so I ordered a 2020 SLR 7 this week. I would have just gone with the SL 7 but the only color available just isn't my thing so I bit the bullet jumped up to the SLR 7. If there would have been different colors in the SL 7 it would have been my first choice. Both are more bike than I will ever be able to take advantage of but I'm not getting any younger and figured I might as well get what I want and enjoy it while I'm able to.