I do like Maximum cards, collect and look for them if they're related to my country (Catalonia, SW Europe) and home-town (Barcelona). I've, even prepared some by myself. Always, looking for "the triple concordance" and:
1.- Use a commercial available postcard, printed before the stamp issue and not by the PO
2.- Cancel with a postmark, relaate to the stamp and postcard. The purists, perfere ordinary pms, but I also like special pms
As an example:
I made by myself this one, by using a commercial postcard and using the FD meter at Barcelona's GPO, as the stamp shows "MACBA" (Barcelona's Modern Art Museum.

Some, people, don't like using FD pm and prefere, instead, the town's ordinary postmark, like this one from Tossa de mar (Catalonia)

In both cases, we can see the triple concordance