I've exeprienced two orders from Leicagoodies during last 4-5 months, bought 2 slings (for both of my Ms), scoop (useless), strap + hook.
They are pretty slow on their shipment, each order took about 2-3 weeks until got shipped over. Emaling them asking regarding the shipment delay, always got various different reasons for the delays, but at the end got the shipment and very satisfied by the slings. Found it to be nearly perfect solution for discrete street work with single camera.
However, I found the scoop to be far bellow the quality expectation from them, turned to be just roughly made piece of plastic, not convenient at all, protruding noticeably above camera's top plate, quite crude feeling.
The strap is not bad as an idea, but cannot be adjusted for length (to fit different people's height) and the stiching made in less then convenient way, very thick and less then confortable on the shoulder. Besides, more then once I hear recommendations to avoid lugging M hanging down on single eyelet, the cameras weredesigned to get carried by two lugs.
The hook is nice idea and adequately implemented. Very easy and convenient to use, however since I didn't find their strap useful for me, the hook rests home...
But if one needs something to get tied to any strap or similar by one end and be able quickly disconnect and get hooked again - I'd recommend that solution.
Hope this helps, Alex