Rover 75, synergy “Ron” box any good?

Hello there, recently graduated to a 75 Cdti
I was wondering if anyone has had any experience with the above tuning box.
I watched a guy on YouTube who’d fitted one to a 255k cdt tourer and he was quite impressed with it (new, haven’t quite figured out how to insert links yet)
He was impressed with the low end power delivery and responsiveness, (that’s what I am looking for) would love to hear some thoughts from experienced Rover heads. Also have ordered an EGR Bypass kit, once again with the aim of better low end responsiveness (and forestalling the problems that can crop up)
Thanks everyone, Regards, Steve