3rd year CKD 7speed version OK.

1st year CBU 6AT version heard got chan to kong

Well, you can go outside and ask those gearbox repairer/expert which gearbox is more cheaper to fix, less issue & longer lasting if maintain well. I bluff you got what to get from Proton? Since they are now not selling 6AT anymore what they want to pay me?  If they are paying me, should ask me to push about DCT gearbox benefit more and not the old 6AT.

Yes, the high failure rate previously is due to a lot of SC/owner did not change the AT gear oil on time coz of the 3 years warranty (Usually SC will not touch the gear oil). This is an open secret that most mechanic also knew about it. Most of the early batch when come out service, my mechanic 1st thing will help check is the AT gear oil. If you ask those gearbox repairer, they will recommend to change the AT fluid around 20k~40k or every 2 years (If always lanjak a lot recommend yearly 20k change).