Just my $.02, I feel like Rusty Brick is a company we should support.
I was a big Rusty Brick fan, but they fell out of favor with me.
They make good apps, but they basically stopped supporting the Siddur app.
In the App Store they promise constant updates- "...it is Rusty Brick's flagship product. We constantly update it, almost every week".
Meanwhile, they updated the app just 4-5 times since the end of last November, with an 8 month dry spell in between.
There are still some adjustments that need to be made to the text, and the new iOS 8 update has terrible navigation.
Bottom line, $10 is expensive for an app that is on the back burner.