A High Standard was the first pistol I ever shot, back in the early 1970s. I was still young back then. Although I'm not much of a handgun shooter, I've had three High Standards and currently have a Tournament model. As noted above, they were among the best .22 semi auto pistols made in the USA. After the factory moved to New Hartford, Connecticut, from Hamden, and company financial difficulties, quality began to decline, although there are many, many very fine New Hartford guns. The triggers are exceptional. Original magazines usually work best.
High Standard "gurus" on Rimfire Central, are quick to remind shooters to avoid high velocity ammo in HS pistols and stick to standard velocity. They say using SV ammo will help minimize the risk of frame cracking. These same gurus also remind HS users to replace the recoil spring if the pistol has seen much use, which they say occurs after ten to fifteen thousand rounds -- or when the spring has lost 10% of its strength. No doubt there are plenty of shooters who have experienced no problems with HV ammo and have never replaced a recoil spring. I'm just passing along the advice.