Received my V3 viewfinder last week. Although, It doesn't fit k-01 perfectly, it's still usable and I reallized how useful it's on K-01. However, my key issue is the tripod mount, and because of it, I can't keep camera on the flat surface. Fortunately, a friend who is a Canon user liked it and bought it from me so I have ordered v2 now, will update the post once I receive it.
There is another sleek product,
ClearViewer home I plan to try them too. Wrote to them about K-01 and NEX support and waiting for their reply.
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