This is half the price the Panasonic Four Thirds adapter goes for, I'd be interested in how its machining tolerances compare. The Panasonic adapter has excellent infinity focus registration, but does have a slight bit of rotational play.

In addition to legacy Four Thirds lenses, I also use these adapters to mount Minolta MD and Nikon F-mount lenses fitted with thin Four Thirds adapter rings. The Minolta adapters are semi-permanent, using a set screw to rigidly mount the ring to the MD lens. The advantage is that you can insert a shim between the lens and adapter to calibrate infinity focus individually for each lens. Here's a link to the Four Thirds adapter rings:

http://stores.ebay.com/Rocks-Photographic-Equipment/For-Olympus-4-3-/_i.html?_fsub=1924693014&_sid=984498914&_trksid=p4634.c0.m322

I had bought one to use with 4/3 Zuiko 9-18mm and it is useless, a lot of soft edges but I think that it can be used with not so wide lenses.

I just bought a used Mark ONE Olympus 14-54mm F2.8-3.5 for half what the used Mark II are going for and bought one of these adapters. Here's some pics of the front, back and on cam. The Mk1 don't have auto focus on the new GHs, but shutter and aperture control works and aperture priority mode works, but it's 3 times as slow as the stock 14-42 kit lens.

For some of the newer Four Thirds lenses, this should work. Here's some pics. I asked for a black one and they sent a silver, so I'm sending this back tomorrow for a black one.

EDIT: Had a spotty wifi and accidentally double posted the on picture and won't let me delete one. Added some more info. The adapter looks good. Metal lens mount points but the silver part, the part that has Viltrox JY-43F written on it...it doesn't feel like metal, but doesn't feel plasticy either. It is plastic in the middle black interior, but for $60 bucks on ebay, good deal IMHO.

but the Olympus 14-54mm Mk1 takes around 2-3 seconds.

It is pretty ok for this lens.
They are not made for contrast AF.

@RatLabProductions The silver one I had and this one are nice and tight, but the silver was REAL tight. The black one is not as tight as the silver but still fairly solid against the camera and lens.

This implies that there could be quite a large margin from adapter to adapter. I ordered from a U.S. Seller that exchanged the silver for black so if you go for this adapter, try and get one from your nation or a seller that will exchange.

Now for same price better adapter with tripod mount is available

http://www.ebay.com/itm/Auto-focus-adapter-f-4-3-lens-to-micro-4-3-quick-release-tripod-mount-plate-/321046792033?pt=US_Lens_Adapters_Mounts_Tubes