You are a very impolite person who simply doesn't know how to debate other people. You are obviously losing the argument, so you choose to insult others.
You say support is at heart of the issue. So, let us see:
On the one side, we have Tascam, Focusrite, PreSonus and M-Audio (ones I had looked into; others likely are same) have been providing drivers for latest OS for devices that are at most 6-7 years old;
On the other, we have Apple, that has been providing latest Mac OS version to Macs that are at most 6-7 years old; for iPhones, it was for devices that are at most 3 years old (and for iPod touch even shorter).
Obviously, a 'DI box', as you call it (although it is a bit more complex than a DI box, with its own operating system, memory, processor, A/D and D/A circutry, etc) isn't exactly the same complexity as an iPhone (which explains why a "DI box" cost $300 and iPhone cost $700), but the fundamental principle remains exactly the same across the board: support for the most recent OS can only be expected for a certain number of years. Again, Tascam isn't ANY different that your precious Focusrite or PreSonus; the way you keep talking about them, one would really begin to thing they are musicians' gifts from God...
Let me distill the argument even further: when it comes to support for most recent OS, all choices are pretty much the same. You get exactly what you pay for. Focusrite doesn't support Saffire on Lion, much like Tascam doesn't support US-122, or M-Audio their Firewire 410. You can keep talking about Tascam's purported "terrible" reputation among "those in the know", but the facts that can be easily googled will remain there.
You may continue to use offensive epithets, but no amount of offensive expletives will change these facts.
And yet, I have still been able to complete the post without calling you a moron... You are certainly NOT making it easy.