I'm running Primal connected to my start9 server running LND and Alby Hub. I'm rather new and primitive when it comes to lightning, and I'll likely ditch Alby at some point, but every zap I've made from the start has gone through instantly.
I've had Alby say my hub is down at times, and I've had a couple people try to zap me but couldn't. So I can't speak for the receiving side yet, but sending has worked every time.