I just returned my Xoom today. It's probably not a bad thing that the Toshiba is coming out in June, because I think Google still needs a couple more months to fix some bugs and glitches with Honeycomb.
Besides a few Honeycomb specific issues, I also had some concerns about the Xoom hardware. The screen quality just wasn't as good as I was hoping, contrast was a bit weak, colors faded noticeably at angles.
I didn't like the back cover, it got stuff marks easy and felt like it was very scratch prone. And it just didn't feel comfortable to hold, I almost certainly would need to buy a gel case for the Xoom.
So I guess it's kinda cool that the Toshiba Tablet already some with a nice rubber backing, hopefully it'll be more comfortable to hold.
I was a bit put off by the Xoom's 730 grams of weight. And that is my biggest worry about the Toshiba Tablet. In video it a Toshiba rep said it weighted a little under 2 pounds, so that might mean it's even heavier than the Xoom. This would probably kill the Toshiba for me.
But unfortunately I'm not too thrilled about the Galaxy Tab 10.1. it's very light at 600 grams, but has not USB port (have to use an adapter cable like an iPad) and no micro SD.
So if Toshiba doesn't pan out due to weight, I'll have to start hoping the ASUS or Acer tablets are decent I guess. Haven't looked too much at them yet.