The only modern slabs I've got are all of the ASE reverse proofs. I really like them. Wish they had minted a 2016 for the 30th anniversary.
I LOVE the RP ASE. I like that version of it much better than the normal one. Canada has a couple RP Maples that I strongly prefer as well.
The ASE RP is on my list of "eventually to buy" coins. I'd love to have a PCGS PF70 but right now they're a little too expensive.