I'm also interested since my sampson is on order. It will have a 4" solid maple top for the turntable. I spoke with Chris Brady at Teres Audio about this a few months ago and he thought solid wood was a good option.
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I have the 3 shelf Sampson rack with the 4" maple shelf and isoblocks on top. The rack is the 26" x 19" size. It is very heavy and stable in my room. My floor is concrete and carpet. I have a VPI Aires II with the JMW 9 unipivot arm sitting on top of the rack. The tonearm literally sits on a pin, so it seems like it wouldn't take much to upset it. I have two little kids who like to scamper in my listening room and have never had a problem with footsteps, vibration, etc. Mapleshade's customer service was great, too. Go for it!
I have 2 Sampson racks with 4 inch top shelves. On one top shelf sits my Michel GyroDec on 3 brass cones where the suspension springs used to be. I can strike the top shelf with my fist and there is no sound with the stylus resting on a stationary LP. The rack spikes dig directly into the hardwood floor.
I used Mapleshade cones and Isoblocks before this on an old teak stero rack. The Samsons improved things to the degree that the prior tweaks now seem like half measures.