RantXL - worth upgrading?

[abgd]

Is it worth upgrading from RantXL 3 to RantXL 4? I understand the differences are partly cosmetic and partly about changes in the charts and geographical range covered. I haven't noticed any real trouble with RantXL 3 other than the rendering and usability of some of the instruments could be improved, but if it's a big step up would consider the upgrade. I'm based in the UK which was already covered by the RantXL maps.

[CharlieDeltaUK]

Version 4 uses Jepp charts so that might be appealing