As long as the scope is fairly modern (say 10 years) and doesn't have a rail, then I would say it is a good purchase. The rail adds complications and the older ones are in need of service by now, far simpler to buy a newer second hand one. For the few old German scopes I've looked through, optically they are not as good as some people make out.
A major consideration for your application is paralax. Paralax isn't adjustable on this scope and will be set to 100 yards normally. At 25 yards you are likely to have problems getting focus, for me normally the result is either the target or crosshairs are out of focus. You may be ok at 50 yards but if a lot of shooting is done indoor at 25 yards, then you may find an airgun oriented scope at a quarter of the price will perform better.