Taken from GSMARENA
Final words
Well, all we can say is that the Sony Ericsson P990 is an excellent smartphone and if you need one you should definitely consider it when making your buying decision. When all the software bugs are worked out, the end product would be a device which hardly has any serious flaws.
The competing HTC TyTN (a.k.a. Qtek 9600) and the Nokia E70 are rather good choices, too, so make your mind rather carefully when choosing the device that's right for you.
When considering some of the competing smartphones with QWERTY keyboards, bear in mind that the obvious advantage of P990 - its touchscreen might turn out to be its most obvious drawback in the first days of usage. The Series 60 user interface is usually a lot easier to get used to even for an inexperienced user. The UIQ 3.0 interface would create many inconveniences for a novice. You would have to use the stylus all the time and while it may seem easy, in fact it demands that both your hands are free which may not always be the case. With the flip opened, you can hardly dial a number, for example, without concentrating your whole attention to the smartphone's screen while many of the functions require that you open the flip in order to use them. So in the end, it's a bit of trade-off. And where you stand is entirely up to you.
I still don't think it's my choice of phone. Personal oppinion that is.