I replied to John but I guess it was not on the list. I think this
survey isn't unusual and probably is more about students perceptions
than PSPP.
ERIC shows one other paper about PSPP:
https://eric.ed.gov/?q=pspp&ff1=subComputer+Software&id=EJ1194048
This paper also doesn't look to be about PSP
Somebody pointed out this research paper to me:
https://eric.ed.gov/?id=EJ1231626
Whilst I'm personally pleased that the authors give a positive conclusion,
I can't help thinking that their methods and their reporting could have
been a lot more rigourous.
The paper doesn't seem to pose a clear