lately they've just raised the airbrake prices to more than 600% WITHOUT ANY NOTICE! I see that exceptional cost 9 usd/month (per project or account? it's not clear)
I'll see what they'll do, and eventually migrate to an open alternative. 5 usd/month for 4 projects is great, 35 usd/month it isn't (speaking for a bootstrapping startup where every cent can make the difference)
The main problem IMHO is that they did this price increase without any notification to current customers. I saw it just because I needed to upgrade my cc number, otherwise I won't have discovered it.