Research properly before using any piggyback as our original ecu is very smart. If you are using a piggyback with same or less bit as our original ecu it might reset to default sooner or later because the original ecu will slowly take control and reverse all the tuning that you have done. Personally still using Unichip and speak from experience. Moreover, you will notice every function and feature in your car to be laggy.
Best if you reflash for minor modifications or get a standalone ecu such as HKS FCon VPro if you planning to major modifications such as supercharge/turbocharge/stroker kit.