Because products can and do change, simply browse to the sale page of the device you're concerned about - at that time - and scroll down to X10 Features.
Stu's Views is Education and Fun. What do YOU want to VIEW today? MathLandia High school mathematics fun and learning. Both Stu's Views and MathLandia are free websites that do not sell anything. Saving energy is not always free. Be a world saver.
Some of the new I2CS protocol modules have dropped X10 support. No X10 support is not across the board so as Stu mentioned. Checking the sales pages would give you the answer.