With Wi-Fi, a large screen, 3G HSDPA, Bluetooth & built-in GPS included the HTC TYTN II (otherwise known as the O2 XDA Stellar) is quite possibly one of the best-equipped mobile smartphones on the market, as most users' needs are catered for. The only mobile-devices that can even come close to competing with the TYTN II are probably HTC's own Advantage or Shift.

The build-quality on the TYTN II is exceptional, though the fact that it weighs a hefty 190 grams does play a part in contributing to this.

A full QWERTY-keyboard may not seem particularly special on a smartphone, but the TYTN II does have a surprise in store. The keyboard slides out from the right-hand side as opposed to the left which is what we're used to seeing, but after being fully slid out the keypad can then be slid upwards to a 45-degree slant. This is a much more sensible idea than it looks because it combines a good-viewing angle with better elevation when typing on the move than other smartphones.

There is also an unusually large amount of controls located underneath the screen. As well as the central navigation and soft-keys, there's also a Windows Hot-Key, a direct Internet Explorer button and a messaging key. The UI included is relatively user-friendly and shouldn't take too much practise getting top grips with, especially since a basic stripped-down version of HTC's TouchFLO is also included to allow for increased user interactivity.

As if that wasn't enough, there's also a navigation wheel located on the left-hand side with a dedicated 'OK' button underneath the wheel.

A major issue that needs to be addressed is the speed of the TYTN II, which is completely inadequate for a device of this type. If you compare it to most of the E-Ten range of mobile phones along with HTC's own S710 you start to see how underpowered the processor is. This issue is so prominent that it will give many a reason not to buy the TYTN II.

On a lighter-note, it's nice to finally see a decent camera being fitted to a smartphone for a change. Though the 3-Mega Pixel module fitted to the TYTN II won't stand comparison next to the more dedicated cameraphones of a similar spec, it still does deserve to be known as one of the best camera modules fitted to a smartphone. It's not saying much considering the history, but it's a start.

Adding to the all-round capabilities is the integration of a GPS-receiver. In the retail package there is also a 'Taster' version of the Tom Tom Navigator 6 software which allows download of one European City map for free.

In terms of the features and capabilities offered, there is no doubting that the HTC TYTN II is one of the most richly-endowed devices on the market, but it is let down in some key areas.

The weight of the device is not much of a surprise considering, but nonetheless it is something that many will take into consideration. What is more concerning is the insufficient processor implemented to handle the wealth of features offered and the (at times) excruciatingly slow speed does go a long way to making the TYTN II less and less appealing.

In spite of this, the sheer amount of available features on offer does mean the TYTN II will have very few peers and will certainly manage to gain plenty of admirers, let's just hope they're not in a rush.