I am fortunate enough to own 2 a 7/8 in purple heart and a 6/8 in rosewood burl, they are 2 very different razors as I believe the 7/8 was one of Tim's earlier models and the 6/8 later but then agaiin Tim being an artist and doing each one individually you will have differences.The 6/8 is more of a standard size 6/8 while the 7/8 is larger then most 7/8 razors in overall size. The razors are perfect in every respect from the metal the grind to the the fit and finish of the scales. To me they shave great and hold an edge great, that said a $100 Dovo properly sharpened will do the same thing. Are they worth it if you can afford it that is something you will have to answer but for me well I got 2 so far :D and you rarely if ever see any of them for sale on any of the shaving forums either and when you do they are gone instantly.
If you e-mail Tim I believe he does take custom orders but all sales go through classic shaving who occasionally gets some in stock as well, if you do e-mail him do give him time but he will get back to you generally within a week or so, in addition to work he has some pressing family issues and I don't think he is always on the pc as some of us are, but once contacted he is excellent to deal with.