I've had a different experience using their Ruby SDK and have not found it as friendly for developers. Their API is decently documented but their implementation for paying is dependent on redirects and URL callbacks. The ruby SDK provides little more than a wrapper for passing and retrieving JSON. Some may prefer this but I felt that I was reinventing the wheel.

I am staying with them for one project because of some services they have that no one else offers.

I am rooting for WePay but they need to work more on their SDKs to be developer friendly.