If you’re buying 2nd hand pay particular attention to the welding webs around the shock mounts on the alloy frames and examine the BB shell for longitudinal cracks as some had faulty machining on the BB shell, the rear swingarms around the main pivot can crack as well, all dependant on how folk run their shock pressure in my opinion , If a carbon frame then examine the BB shell/cluster area with a bright torch and if you see what appears to be hairline cracks in the clear top coat then walk away, quite a common fault as not enough carbon lay-up in this area for the 2012 frames, the headset (cups) on zesty carbon 914’s can sometimes be oversized leading to a very loose fit of the steel bearing cups.
Apart from that very good bikes.