It will sit higher and is a cheaper way to lift your RZR..But...Your ride quality is going to drop..My buddy had spacers on his commander instead of a lift and me and another guy bought the RT lift and he couldnt keep up with us riding 10-15 mph because it would beat him to death..Now he did have 29.5 inch laws on it to though..
I would buy some springs because you are going to need them anyway sooner or later if you dont already need them..You are doing a temp fix for your ride height and may satisfy you for a little while but spring sag will continue to happen. If you buy some RT springs it will bring your ride height back up to normal if not slightly higher, improve your ride quality and it will last. Then you can buy the RT lift and your set for a long while..
Like you said $25 bucks is not going to break you so if you dont like it then you can take them off but you will eventually have to do something different.
Good luck with your decision