I’ve roasted over 1,000 batches on my R1v2 over the past 10 years (!) and it’s been fantastic and very consistent (sometimes shockingly so).
To make periodic maintenance more streamlined, I just upgraded to an R2 (not Pro) and it seems like my normal 755g recipe of preheating to 295°C and power level 7 needs to be tweaked because the roast times are a good 20% longer on the R2 at the same settings. I just tried a roast starting with power level 8, and it was a bit better, but still lagging (on the same beans) the R1v2.