It came out two months after the iPhone 3G and the app store. I remember it being extremely laggy, even scrolling basic webpages while the iPhone was buttery smooth. And for some reasons they wouldn't include Wifi on it, so even indoor it was forced to use edge making it even more sluggish.
You couldn't really install apps on it, there was no app store. I mean I think there was an SDK but it was for that device only and no easy distribution method. I don't think anyone ever bothered anyways.
Blackberry was at least 3 years behind at that point, having almost managed to ship an original iPhone's prototype in terms of specs.