ive only used classic. and i use the desktop app weekly and the ios app on my iphone daily. always been very happy with the classic app. its made the not fun task of budgeting and tracking spending much easier and bearable. and YNAB how-tos brought clarity and simplicity to personal finance accounting for me... cant speak to customer service bit as ive used the app for years and never had a problem.
i.togusa about YNAB Classic, v3.3.2