Inkpad 3 - PDF highlighting

Hello

Interested to try an Inkpad 3 mostly for PDF reading I'd like to know how reactive and sensitive it is for highlighting text in PDF files. I'm ready to install koreader or any reader that could be better than the native PDF reader if needed.

Is it easy to highlight sentences with this ereader, starting and stopping when you want? Is it fast? How does it compare to Kobo/Kindle (kindle being faster than Kobo..)

Thanks!