I've looked at them briefly but I'm worried about vendor lock-in and unpredictable pricing. The pricing one is a big aspect if I'm wanting to sell something to

I've looked at them briefly but I'm worried about vendor lock-in and unpredictable pricing. The pricing one is a big aspect if I'm wanting to sell something to a client as the pricing needs to be simple and predictable. Any thoughts? Also, how well do these work with source control? I like having everything under source control for easy reviews and rollbacks.