Just took delivery of my MC-10. I got the blue one and it doesnt look as funny as the photos.
The beam is quite nice. Its very smooth and pattern is like that of a sun. There is a very round spot, very bright, very white. Around this is a fairly wide corona, about twice as big as the spot, probably a bit more than double the radius. This corona has a greenish tinge but its quite a bright corona and seems quite useful. The rest is a very wide spill, about 4 times the radius of the corona. With the diffuser on, the greenish tinge is no more. There is a more diffused spot and the spill is much brighter with the corona being less visible.
The switch, theres certainly no chance of accidental activation. It is stiff but its not too stiff. No problems here with a soft squishy thumb. Certainly not too hard to double click the switch between flashing modes and normal modes.
Tail standing is a bit funny. If you angle the head all the way down, it tips over. To overcome this, you need to have the clip at the back and the triangular ring angling up. Move them a bit and it tips over. If you have the diffuser on, you need to have the hinge on the bottom. Its a lot better with a battery in it. It can tail stand without having to fiddle around with the clip and ring.
Using the clip, is really versitile. Its a bit heavy if its clipped to the bill of a soft beak cap but I clipped it to the side of the cap so the light came from the side of the head like the fenix headband. Clips to the belt, pockets, shirt pocket, collar, shoulder strap. Not so good with loose shirts. I have it clipped on the side of my jeans on the belt. Have to wear the trousers a bit higher though to limit movement. The clip is very tight, very strong.
I like the angling. Its so practical. The instructions mentioned it can be used with a tripod. I'm assuming camera tripod but I cant see any screw holes to mount it on so maybe not.
What would be nice is a red diffuser. I could clip it on my backpack when I'm on my bike. I've cut a small circle of red cellophane and stuck that on the diffuser and although it works, a red diffuser would be the works.
Almost night time so I can test it in the dark soon.