Ibanez has also released a Tub Screamer that uses them: https://www.ibanez.com/na/products/detail/nts_01.html
I had the "Clean" one for a while, which mimicks a Fender circuit. It sounded pretty darned close to a "real" tube amp. The only reason I got rid of it was I got a Fender Super Champ x2 with USB out for recording more easily.
Ibanez has also released a Tub Screamer that uses them: https://www.ibanez.com/na/products/detail/nts_01.html