Here's FXDB's interview with Manfred Sigmann of McGillwell:
How did McGillwell start?
In 1980 Manfred Sigmann designed the “McGillwell active Booster”, the first preamp located inside the guitar that creates a clean and overdrive sound. At this Time there was only the “PowerPot”-preamp in the USA (only for clean sound).
We have had a good dicussion with Seymour Duncan and Bill Lawrence at this time, they inspired us.
Where do the name and logo come from?
It's self designed and a Trademark.
What sets McGillwell apart from other builders?
The special overdrive sound - you can't find it anywhere else.
We work with outside suppliers and do the final checking in-house.
All products are built to the normal industrial standard.
How important is the look of your pedals?
Not really - the sound is important.
Is parts selection important?
Yes, we now only use high industrial standard components.Which of your pedals is the most popular?
McGillwell Active Booster.
Who uses your pedals and for which genres?
We make products for all musicians.
What does the future of McGillwell look like?
We are still producing the products we designed in the 1980's.
In 2012 we will produce new stompboxes with “McGillwell Active Booster Sound”.