Flew WAW-SIN-WAW In PE last May and had positive feedback.
In addition I found LOT to have the cheapest MyOffer bid to upgrade from PE to Biz, below 400 Eur one way. i made the minimum bid possible and it was accepted probably because the route is not served daily hence not so popular and most business passenger fly with other Star Alliance carriers.
you don’t have internet onboard but for me it was not a major issue.

PE catering food is same as Y class but in porcelain on a tray, is not the same as C (at least in my experience)