I was CO captive in Houston while working there full-time and CO/partners got me where I needed to go in oil patch. Retired last year and returned home to Hawaii right when the merger was happening and it couldn't have been at a better time. As a consultant who commutes monthly (occasionally more often) out of Maui back to Houston and/or wherever they send me, the UA/CO merger has worked out perfectly for me. I like my upgrades and flight options, which are far greater than CO could have offered out of Maui/HNL.
Except for one cancelled flight last summer and one 6-hr delay last fall, UA has generally gotten me where I need to be on time and I've probably consumed 40 ice cream sundaes in last year