Really depends what outcome you are looking for.
If it's only velocity/pressure outcome on standard cases using oddball powder, then maybe, but not what I bought mine for.
If you just want to put in 'what if's?', then it just might be what you need. It works well for start loads on wildcats with most powders, but take the outcome on max pressure as dubious.
I bought mine, and Pressure Trace II at the same time because I was delving into serious cartridge invention, wildcats on extremely altered parent cases where extrapolation wasn't even in the mix.
However, even with accurate measurements of capacity and other factors, QL never matched the actual numbers the Pressure Trace or Oheller 35P showed. It was considerably different across the board, which is understandable with a PREDICTION program.
I sold mine after not being able to match real world numbers with predicted numbers without changing burn rates, velocity inputs etc etc.
Cheers.