I have one Eheim connector leak on me after many years but generally they are ok.
I have since switched to Shiruba taps because the 12/16 and 16/22 are interchangeable. Their hose locking mechanism I feel is more "secure" than Eheim. Don't think the brand is available in UK but interchangeability between 12/16 and 16/22 might be a useful feature when choosing what to buy.
No problems with the Shirubas since I posted this in 2021, and I have 4 pairs of Shiruba double taps in my setup.