They are ok. Management is nothing special and could use improvement, very similar to ASDM. It is annoying that HA pairs don't configuration sync so you have to do every change twice. The default signatures have rarely dropped legitimate traffic for us, which is a problem we had all the time with Juniper IPS. Also keep in mind that if you have an ASA that is passing a lot of traffic turning on the IPS can lower your throughput quite a bit.