I shot my friend's original Shield and his new Shield Plus, side-by-side with my Hellcat. The Shield Plus was the most comfortable to shoot, of the three, and I shot it better than the others, as well. I like the sights on the Hellcat better, but I was pleasantly surprised by how much I liked shooting the Shield Plus.
The Mag Shack lists the Shield plus magazines on their website, but both the 10 and 13-rounders are currently out of stock. I'd use their e-mail notification system, and get on the list.
https://themagshack.com/?s=shield+plus&search_id=1&post_type=product
