I had been using the slideout keyboard almost exclusively when I got my droid because I had never used an onscreen keyboard before and I was most comfortable with it.. I have since been trying out the touchscreen keyboard.
The landscape board is really nice and accurate. Too be honest, I'm not sure how much I would use it because the slide out is one push a way and I feel more in control with the slide out..
The portait keyboard I thought I would hate because the keys just look way too small for me to do any typing. But I have been very surprised! It's actually pretty accurate- and even if it's not, it doesn't matter because the autocorrect is soo good as long as you pay attention to it! I decided to just type as fast as I could for fun on it and I was making mistakes everywhere with it but the autocorrect fixed all of them I started cracking up! It's almost like if you're in the general vacinity of the keys you wanna press, it will figure it out... very cool