I will continue to buy supplements and adventures that are compatible with CT - that means they could be written for CT, MT, T4, and perhaps T5 and MgT.
Minimal conversion effort is important to me. If it slots into CT readily, I'll have a look.
This is also important to me. Though it isn't CT/MT, I'm hoping several pieces of T5 will nevertheless be compatible with it. I saw Mongoose's starship design looks like Book 2 -- has anyone compared starship designs between the two?