I have been using 4 GE Links for about a year now on ST. I really like the bulbs light pattern (side and top focused) and they are brighter in a fixture that has a shade.
3 of my bulbs are on manual switches, which is not the best application, constant power is required for status. Early on I had a couple disconnects, but overall reliability. I never had the constant disconnect problems others have reported, it may depend on one’s RF environment. The switched ones will always show “On” as the status as the hub never gets the off command when power is cut. When switched on they are nearly instantly controllable and dimmable from ST.
I started with the Links paired to ST, over time tried them paired to Hue hub. Hue hub worked reliable as well and seemed to report better. Recently the Hue hub has updated and just reports them as “Unreachable” all the time and although the bulbs react to Hue commands the status is not reported back. I have now paired them back to the ST hub and if the switch is on, the correct status is displayed.
When the new Hue white bulbs came out at the same price, I started adding these. But they are not as bright, regardless of the spec because of the softer focus.
Conclusion, I would buy more Links if they were less expensive than the Hue whites (which after a very recent ST update report almost instantly back to the ST hub) for certain fixtures, outside lamps come to mind since they radiate away from the house better.
I hope that helps, my ST relationship is a love/hate one, but natively supports everything important to me, Hue & Echo.