A small update from me, I‘ve been happily using my C1.2, I never did buy an X1 as i had a power conditioning which seem to improve the C1/C1.2 so about 5 years I got a T1 (without GPS) instead. Then today my GPS module arrived for my T1, it took seriously long time for the GSP signal to sync On my T1, as i live in an apartment and the GPS signal is very weak.
But once it had finally synced, it felt like my C1.2 became C1.25, the improvement along the same lines as from C1 to C1.2, but not quite as profound or as big.