The only one of those I have played is Scratches. It's a good game and I enjoyed it, but that mouse lag glitch you were talking about is a major problem and really cuts into the flow of the game. I've looked for solutions on here and other web sites but it seems to be an unresolved issue. I liked the game enough to play through despite it, but it really slowed me down and hampered my ability to explore, at one point I had to resort to a walkthrough because I didn't have enough mouse control to search the relevant area. If you are the kind of person to be bugged at this then yeah, you will feel like you wasted your money. It was the Scratches Director's cut, by the way, and the Last Visit segment played fine, although it was kind of short and cheesy
Good luck deciding where to spend your $$
