Used my flat top last night. Some points of interest:
No scritch
Plenty of scrub but not uncomfortable, similar to a soft boar.
It doesn't splay a lot more than the 2 band fan, I thought it would be more, given its shape, even though it is a DO1 2band. It is however more controlled in lather placement than a standard 2 band fan in silvertip (knot size 26mm) again surprised at this.
Once painting the brush is super soft. As soft as a 2 band silvertip.
Something that really caught my attention was looking at the surface of the knot this morning. I had left it to hang to dry overnight. This morning on inspection, a small wet patch was visible. With the fan and bulb knots you don't see this. I assume (with regards to the flat top) due to the close proximity to the shafts and the 'slim' profile of the knot. So it has made me appreciate that if I want my brushes to fully dry it takes longer than overnight, with respect to the D01 2bands. When flicking these knots to dry they surprisingly (bulb or fan) feel drier that the standards.
The main advantage apart from the visual aspect (IMO) is how quickly the brush turns a soap load to luxurious lather. The surface area is much larger, as well as all the tips being in contact with the face.
Having analysed the brushes. These remind me of Bernd's old hair, in that no smell exists from outside the box. If anything you smell a polyethene type scent which is probably the packaging. However when wetted the stink is apparent. The brushes once used and dried several times should develop 'crispy' curled tips. Time will tell but this is my prediction based on past brushes.
Very happy with all 3 will be using my unique bulb this evening.
Flat tops or extreme will feature in the next LE group buy.