All completely rebuilt, but the newer ones are - generally speaking - better than the launch ones. Even the Line 6 engineers admit that they've gotten better at the process as they've gone along balancing stark accuracy with what actually sounds good to their ears.
Honestly, you could stay with just the Mesa LoneStar, PRS Archon, Friedman BE100, Voltage Queen/Victoria Electro King,Matchless DC30, Litigator, Badonk and Cartographer models and cover about the whole spectrum of tones from virtually any amp out there.
I mean, you got Vox (BE100 clean channel, Matchless DC30), Fender (Archon and Lonestar clean channels), Marshall (Friedman, Cartographer), Boutique/Dumble (Litigator) and multiple high gain flavors (Archon, Friedman, Cartographer, Badonk)