I used to use MK about 20 years ago but switched to Hager over 15 years ago
The quality is good, I also like that they now do dimmer frames that let you put other dimmer modules inside- that way you can have a Varilight or Bell dimmer inside with the Hager frame- nice touch.
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I find the quality of the sockets particuarly good- the safety shutters require equal pressure on all 3 terminals to allow them to open, the neons on the DP switches are actually LED's and are also internally wired
The acessories have all the terminals facing up for ease of wiring, all in better design and higher quality.