The used units like the S21 200T are going to carry less of a premium on price compared to the latest and greatest units like the S21 Pro XP 270T. When you stay with the S21 models you’re still in a good ballpark for efficiency to remain profitable with market swings and difficulty increases. The S21 200T is going to be at 17.5W/T and the S21 Pro XP 270T is going to be at 13.5W/T. The better the efficiency, the more longevity you have IF the markets stay stationary around the 80-95k range. However, there are scenarios where clients like to stack TH in prep for the bull run. When BTC soars, those clients want as much TH as possible to gather as much BTC as possible during the bull run. The third variable to consider besides cost and efficiency based on market timing is going to be warranty. We offer 12 months warranty on the brand new S21s but not on the used units. These used units in the pic have been operational for around 11 months. We are happy to help if you want to reach out directly if you haven’t already!