I just started to use PI Expert software and found it very well designed. But there is on place where it can be improved - PCB recommendation. While it gives ready solution, it's not always useful, especially in cases of 2 layer PCB, just because components and conductors covered by the copper filled areas.
If there was possibility to change transparency for top copper layer. or to hide it, or to flip the board - it's was very helpful, effort and time saving feature.