The GAMO Compact is a remarkably accurate SSP air pistol at a remarkably low price, so it can be a very good first choice for a budget target air pistol.
The wooden anatomical grip with an adjustable palm shelf is also excellent (especially for the money) but fairly chunky, and this can easily be re-shaped to give a better individual fit if required.
We had two of these in our club for some years and they both performed really well, and gave really good results with no failures. One was sold some time back and we still have one in the club.
Upgrading may not automatically give you higher scores than you could achieve by working with the GAMO to get the best out of it, but many do upgrade when funds permit to a higher quality air pistol when they find something that works better for them.
What people buy after a GAMO depends entirely on what they can afford and what fits and works best for them, so I suggest that you don't upgrade by buying anything else until after you have tried as many different types as possible at your local club to find out what type works best for you.