s1's were great reliable miners , im still partial to the 12 s2's i still have running to this day they have been on 24/7/365 for a long long time , only reapirs on them have been regular cleaning and a few psu fans have needed replaced

that being said all my s1/s2/s3 miners have been the most trouble free miners i have ever had , seems like quality started to take a turn at the s4