Keeping your customers happy is a problem a lot of startups are really bad at. The products may be great, but problems are inevitable. Sucky support might be ok

Keeping your customers happy is a problem a lot of startups are really bad at. The products may be great, but problems are inevitable. Sucky support might be okay for lifestyle products, but you can't get away with it if your customers really depend on it (cars, bank accounts, etc.).