I bought my Universal Audio Solo 610 used off of ebay a few months back and it is in good condition. I can provide pictures and sound samples upon request.
I'd be willing to trade the Solo 610 straight up for a built J99 (as long as there's 2x John Hardy 990C's installed), if you are willing to to pay for the cost of shipping for both the UA Solo 610 and J99- if the cost is unreasonable I might consider just the difference in shipping for the two items, depending on where the J99 is shipped from.
Since I'm in Canada the total I'd be paying after tax, including shipping for the op-amps and module for a J99 is about $600 CDN. I paid around $700 CDN incl shipping for the Solo 610. The J99 is the only kit that I've found that is the same price for me to get built through a third party US technician as it is just to ship the unbuilt module and 990 op amps from SCA & JH Co respectively.
The reasons I would rather have a J99 over the SOLO is that I have to conserve tabletop/rackspace and also have 3 empty slots in the CH01. Also I wouldn't mind adding a contrasting flavour to the mix that my A12's and N72's can't offer.
If I can't find any interested parties- I'll just keep the Solo since I'm more than happy with the sound- it's more the form factor that's of greater importance for me as a J99 wouldn't be occupying any real estate in my rack that's not already called for. Plus it's a Jensen Twin Servo circuit.
To clarify, just like the author of the original post mentioned- I'm hoping to do a straight up trade. The only money required would be for shipping, which I would get correctly priced from the post office.
I'm most comfortable dealing with people with ebay ID's in good standing since I can also verify location and feedback score, and vice-versa for anyone interested.
PM me...if this seems like a reasonable deal.
Regards