Hell yeah!
The first SMT game I played was Lucifer's Call (aka Nocturne) and it was brilliant! It's definitely my favourite RPG and great if you're looking for a tough but fair challenge. It's like the Dark Souls of turn-based RPG's.
I'm really looking forward to Persona 5, although I'm a bigger fan of the main series. I've played some spin-offs other than Persona, I have the 2 Digital Devil Saga games, Persona 4, SMT IV, I used to have Devil Summoner: Raidou Kuzunoha vs. The Soulless Army and I plan to buy Devil Summoner: Soul Hackers on 3DS soon. And I'll get all the other games in the series eventually.
I was extremely excited when Shin Megami Tensei x Fire Emblem was announced, especially with SMT being the first one in the title, I thought it could be amazing and would probably focus more on the SMT side. But it seems the exact opposite is true. And even though SMT characters were announced along with FE characters, only the latter have been shown since then