This has probably come up before (I searched to no avail) but given the choice in the IRO group buy in between 1" threaded and 1 1/8" threadless, I am wondering, what are the benefits of more modern threadless stem setups? I actually quite like the old, classic look of a nice quill stem, and use that setup now on my conversion. But, given the choice now to start over, why should I consider the threadless setup?