I own a Zone VI 10x8, had an ebony RSW45 and await my walker 5x7XL. The Ebony is leagues ahead of any woodie I have ever used or fiddled with. In simple terms, I never had to pay particular attention to a niggle or had to compensatoe for anything. It performed faultlessly wihout exception. Conversely my zone VI is OK, but has design issues and glitches that whilst perfectly usable prevent the process being the slick pleasure of the ebony and can catch me out if I rush. I fully expect teh walker to be like the ebony in use (having played with one) but without the cuddle factor (but with a 'my camera is bomb proof' factor). If you can afford it, I think the difference is worth it every time. The price difference bewteen the 5x7 walker and an ebony was about £2000+, so the decision was easy. However teh competative RW45 is very close in price to other folders from Wisner, Canham etc. I have not once heard of design issues with ebonies, only complaint at the price (which is not applicable to the RW45UB). Conversely I have heard constant complaints about both Wisners and Canhams with fit and finish issues (wisner), wobbly stadards that dont lock (Canham) and the list goes on. The use has to find solutions and send things back and compensate etc. I would never buy a product that requires this relationship. Arguabley some of the cheaper simpler Wistas are better in this respect.
The only niggle common to all ebonies is that they smash if droped onto a hard surface as the ebony is so hard and rigid. The wood does not absorb the impact and so the joints pop. They are however, easily (professionally) repaired in most cases (speak to Mike Walker as he does this repair job a lot). When I win the lottery, I will replace my zone Vi 10x8 with an Ebony.