I'd be lying if I said I'm not at least interested in trying out the new Z10...... I'm a BB transplant myself (went from a Torch 2 to an LG Quantum when WP7 came out). I'm not saying that I'm not happy with my 920, but I've always kept a place in my heart for BB. I had to make the jump to WP when BB got stale (and that endless hourglass of death that became too frequent on my Torch) and have been pleased overall (except for the slow growth in app support).
That said, the Z10 is a first-gen device for BB10, and there's bound to be issues (and I'm not eager to go through that again.....ahem....LG Quantum......).