Luxnails2015, What CND system are you using? I used Retention+ and always had consistent and good results. I don't think its workability can be beaten when applying and i never had any problems with lifting so the longevity was great too.
I don't think you could go from a premium system like this to a generic system like ASP.
I know a lot of geeks use NSI, but when I used it during a college course many years ago I couldn't get the hang of its mix ratio and therefore didn't have the same ease of application so I ended taking my own CND kit into College!
Are you having problems at the moment, if that's the case maybe we can help, switching systems isn't always the answer.
Whatever you decide though, get a small trial kit to see how you like working with it and how well it lasts before investing In the full system.