Long time Flight Simmer before I decided to get into aviation for real. Used FSX for a long time. CH Products throttle, stick and pedals.

Found that we spent about 3 weeks (2 days a week) unlearning my FSX landing "sight picture"/routine. Echo'ing above, it is good for instrumentation proficiency (also owning the 3rd party Garmin 430 addon made the real thing a breeze). It was harmful to me in letting me teach myself to land a C172 at far too low of an approach path/slope.