Started in on SRW30 the other night and so far I'm loving it. The AOS System, which lets you upgrade numerous facilities of the main ship to produce different effects, allows you to really tailor things to your playstyle. It's usually my first stop after a mission. The original characters seem colorful and interesting, and with its various side and repeatable missions this may be the meatiest SRW to date. My one complaint is that the protagonist's Spirit skills are determined by birthday and blood type, and I went with the default, not realizing that it would lock me out of getting Focus (called Zero In in some previous games), my bread and butter Spirit. Oh well, I'm sure I'll manage.
I recruited the SRX Team right before bed last night, and I was grinning ear to ear at hearing their familiar music and voice acting. Interestingly[1], they appear to be from the Alpha timeline rather than OG, as Aya mentions that they're affiliated with Londo Bell back home. That's unexpected! I wonder if the other OG units will have similar hints as to where they're from; I'll be very surprised if Kyosuke and Excellen turn out to be from Impact.
As far as I can tell the SRX never receives any additional attacks, so I don't know if it's the most viable unit. That didn't stop me from dumping most of my savings into upgrading it and Ryuusei, though.
[1] This is not actually interesting.