I know Quickwire are relative newcomers, and there are quite a few other easy-style connectors out there, but I do think Quickwire will be the new "Wago" for lighting. I also know that many think the cost is quite high, but the time-savings are considerable.
I love new technology like this. Same as I embraced Quinetic many years ago, when the time savings and lack of raggling(chasing) plastering and painting made it a new solution for many cases.
Wireless smoke alarms with radio modules to interlink, and a 10 year life shows the same type of savings...no wiring, chasing, redecoration...might seem expensive, but compared with the alternative, money well spent.
No race to the bottom, guys and girls...spec the good, clever modern stuff...do the job fast and well, no call-backs...and happy clients.
Just my random ramblings...but remember when we had no LED head-torches or cordless drills etc? Now we wouldn't work without them.
The cheapskate boys will always get work, but the quality electricians will always get quality work, and that is what matters in the long term.