Can you or anyone please explain if (and if so how) this will effect the phone speed, internet browsing, messaging etc?
What are the benefits/limitations of having/not having HSDPA support?
For most phone functions there isn't much difference between 3G and 3.5G (HSDPA).
HSDPA (also known as 3.5G) is nothing to do with the speed of the phone itself.
The only thing HSDPA affects is download speed on the internet, for example downloading music files or viewing websites. With HSDPA these will tend to download more quickly, but you will only really notice the difference with very large files. If you're viewing websites you won't notice that much difference, and with text-based internet stuff like e-mail or IM you won't notice any difference at all.
HSDPA can support speeds up to several megabits, while plain 3G can only do speeds up to 0.384 megabits. That means HSDPA can potentially be several times faster.
However, HSDPA only works in geographical areas that support it, if you move outside one of those areas the speed drops back down to 3G or even 2G depending on what network connection is available. HSDPA areas tend to be within cities and other heavily populated areas, in the countryside you will probably only get slower networks.
Also, HSDPA is only for downloads, it doesn't affect upload speeds at all. There's a separate standard for that, HSUPA, but that is still in the early stages and it's quite rare to see it supported on phones. The two standards together are known as HSPA.
This woukd make an excellent, excellent companion for students. I think the battery capacity and price point are amazing.
Yes, I totally agree, it's definitely the right price for students, and it's the right device as it combines both work stuff (good communications, email, qwerty, calendar etc) with leisure stuff (3.5mm audio jack, music player etc) in a way that lets you switch between them instantly.
I could see a lot of parents could be buying their children one of these over Christmas, especially for those who are at university or college.