I've owned two of the .22 caliber TX200 MkIII. Unfortunately, the first one was stolen in Phoenix. At that time, I had owned the gun for three years. I shot at least 400 pellets a week during the summer and about 200 pellets a week during the winter. I know that I used 15,000 pellets over the course of one year. I chronograph the gun every month. She started at 20fpe and settled in at 18fpe. After three years she was as good as the day I bought her and still firing at 18fpe. My second TX200 started at 22fpe and has settled in at 19fpe. Both guns started with a standard deviation of 3fps and then dropped to 1fps after settling in. I don't use heavy pellets. I don't keep the gun cocked for more than 30 minutes at a time and I store the gun lying down (never in the vertical position). When the spring does wear-out, I'll just replace it. There is no training or special tools required with the TX200 MkIII.