I use it to get into cars that other companies don't provide and have rented porsche boxster S, and audis. Looking at getting a 356 speedster in Tahoe for my next one. All of the cautions apply - privately rented; problems can put you in a bind without corporate backing for remedy; risk of nit-picky owners who will try to ping you for prior damage; mileage limits. Due diligence is the best you can do and even that doesn't mitigate the risk entirely.

For value, though, rent your car through Costco. Prices don't get better.

For fun, find a car through Turo.