I remember buying a WAC chart as a young private pilot because I was curious about these "other" charts for sale. I immediately found that they weren't so great for flying around in a 150 or 172 because the scale didn't allow for much detail. Later one of the Part 135 operators I flew for had them as their required VFR backup charts. (You couldn't cancel IFR, even on an approach, unless you had a current VFR chart onboard.) In a 310 or 402 using VOR navigation, the lack of detail wasn't such a big deal and you weren't running off the edge as quickly as you did with sectionals.
Flying in Belize in the 1990s and early 2000s, we had years old WAC charts that we treated with great care because VFR chart publication for Central America had been stopped as a part of the war on drugs. (They'd also dug trenches across the runways at a bunch of little-used airports, scary. The drug runners simply landed on the roads.) We made do with what we could get . . . old WAC charts, highway maps and going to the Civil Aviation office and making notes on changes that they had on their current chart displayed on the wall (and the warnings of live firing exercises carried on by the British Royal Army at Baldy Beacon in the Mountain Pine region). (Stayed well away from there.) Also stayed at least 500 feet high along the coast because the RAF Harriers would be flying the coast at 200 feet, going like stink.
