From the restoration description on the site, there should be ample pictures and videos of the restoration work. I'd at least ask for them if nothing more than to see the reaction (a sniff test as it were).
Provided that the machines have been torn down and built back up again, I would have to agree with some of the above that it depends on who is doing the work. Lawrence Cuthie doesn't stand out as a restorer I've heard of, but perhaps others here know of him or his work.
Both these machines are on my wishlist, but I wouldn't touch either for those prices even it was by a well known restorer. Personally, I don't think I'd pay over $1500 for F-14 or $2000 for ES for absolutely beautiful collector quality examples - delivered (assuming locally). For this type of machine, however, I would expect to find nothing wrong with it - no scratches, dings, nothing out of place. Additionally, there would be no way you could recoup these prices if you were to resell them down the line (barring any extreme change in the landscape).
Just my opinion....ymmv