Older vs. newer REL subs


Looking for any reports about older vs. newer REL subs.

I have a REL 328 (ca. 2013) which I bought used. It's a good sub.

https://www.hifiplus.com/articles/rel-r-328-subwoofer/

I would like to upgrade to stereo subs and I've found (finally) another REL 328 which would match mine. But, before I drop coin on that, I'm wondering if anyone has had experience comparing their older REL with a newer one. What's changed? What's better, worse, or the same? I'm considering the T7x and T9x lines.

Hoping for apples to apples comparisons, vis a vis driver size, type of sub (e.g. level of product line, sealed vs. ported, music vs. HT etc.) but whatever old vs. newer comparison you have much appreciated. 

Thanks.
hilde45
3 times...boy thats a lot,lmao....so your point is what? That the new S series is also fantastic at home theater?..its obvious your not listening or understanding,so yea this is a waste of time!
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@noromance,

I agree. R8 was under speced and sticking it inside a cabinet with no air flow ensured its demise. Most failures of the ST series were solely because of R8.  
When did I say the T series,was for home theater....you have me confused. Im the guy that went from T series to S series in the past 30 days trying to give you first hand advise ....
@missioncoonery My mistake! My apologies. It was not you. I will delete my post!

By the way, I'm in discussions about the S series, now. Thanks for your reports about your experience.