Manabu Sakai is your "typical Japanese" when it comes to not providing specifics. One of my biggest headaches when I first came to Japan was that very cultural difference. Even their language centers around that -- they hardly ever say "I" or "you" but just structure the sentence such that those things are "implied."
Anyway, as I wrote in my reply on Vintage Macs, I believe it could be a chip sourcing issue. My own company manufactures electronic devices in Taiwan and China, so we know this to be true. The bad economy has bankrupt many companies. As a result, a key component could have been EOL'd or the manufacturer of the chip may have ceased operations entirely. If that happened a few months ago, even their distributors may have run dry of stock of the needed chip. In such a case, they would need to find a pin-to-pin compatible chip with basically the same specs as the one they can no longer buy. And if they cannot do that, they would need to find another chip and then change the PCB to accommodate it. Changes to the PCB takes time, especially because you need to build a sample and then extensively test and debug that sample before mass producing it. Then once you've found your replacement chip, assuming it is not a chip dealers stock, you could be forced to wait 8 weeks while the manufacturer schedules a build for you.
Again, this is what my company has had to go through over the past year (we are based in Japan too), and I know it is a very real problem. If Manabu Sakai would just give those specifics though, I think it would work to make buyers and potential buyers a bit more patient if not understanding. But just saying "wait a few more weeks" only leaves one to wonder about the real problem and wonder if Sakai has the ability to solve that problem on his own. It's too bad too because the product Sakai is selling is built for the SE/30, and he will guarantee it to work, and he even puts up a performance chart for would-be buyers -- very much unlike the PCD-50B device being discussed in this thread.
Anyway, as I wrote in my reply on Vintage Macs, I believe it could be a chip sourcing issue. My own company manufactures electronic devices in Taiwan and China, so we know this to be true. The bad economy has bankrupt many companies. As a result, a key component could have been EOL'd or the manufacturer of the chip may have ceased operations entirely. If that happened a few months ago, even their distributors may have run dry of stock of the needed chip. In such a case, they would need to find a pin-to-pin compatible chip with basically the same specs as the one they can no longer buy. And if they cannot do that, they would need to find another chip and then change the PCB to accommodate it. Changes to the PCB takes time, especially because you need to build a sample and then extensively test and debug that sample before mass producing it. Then once you've found your replacement chip, assuming it is not a chip dealers stock, you could be forced to wait 8 weeks while the manufacturer schedules a build for you.
Again, this is what my company has had to go through over the past year (we are based in Japan too), and I know it is a very real problem. If Manabu Sakai would just give those specifics though, I think it would work to make buyers and potential buyers a bit more patient if not understanding. But just saying "wait a few more weeks" only leaves one to wonder about the real problem and wonder if Sakai has the ability to solve that problem on his own. It's too bad too because the product Sakai is selling is built for the SE/30, and he will guarantee it to work, and he even puts up a performance chart for would-be buyers -- very much unlike the PCD-50B device being discussed in this thread.