Using Zenyum was easy - customer service and experience was great. I was a lil bit disappointed to find out that when i switch to wearing retainers, it would be for 20 hours per day which is almost similar to wearing the invisible aligners for 3 months. The plus point of wearing the aligners is that i snack less so it helped with me not adding any weight.
Overall, i would still recommend it - it is worth the price and you get used to wearing the aligners.