Okay, so I know a little about computers and all that jazz. But I like things simple, so my review will be written from a layman's point of view.
If you are using Windows 7, you might have come across the Windows Experience Index (WEI), which is a rating from 1.0 to 7.9 of five different factors that can affect the efficiency of your computer. I'll give you my old setup compared to new, with WEI ratings for the two relevant factors (Windows Aero; business and gaming graphics)
My system is a Dell Optiplex 745, 8GB of RAM, with Intel® Graphics Media Accelerator 3000 (integrated)
OLD WEI ratings (using integrated video card)
Windows Aero: 3.4
Business and gaming graphics: 3.1
NEW WEI ratings (using this HD5450 card)
Windows Aero: 5.6
Business and gaming graphics: 6.0
Bear in mind the ratings go from 1.0 to 7.9 - I think 6.0 is very good for such a low cost card. Also, the ratings were BEFORE I decided to overclock the card. What you get with the card is a CD with software, and this software allows you to overclock your new card to run even faster! So whilst I can't imagine this graphics card being able to run the latest games at high resolution with fast FPS, everything I need runs efficiently and fast.
IMPORTANT NOTE:
You receive the card with a standard profile bracket plus two optional low profile brackets. There were no instructions, but it wasn't hard to work out that you need to remove 4 tiny metal nuts, remove the standard profile bracket, and then you attached the two low profile brackets to the card.
Basically, one small bracket holds the HDMI & DVI ports, and the other small bracket holds the VGA port. In essense, unless you use HDMI or DVI, you'll end up using TWO PCI slots to run this graphics card. The reason is because the HDMI & DVI ports are on the PCI card itself, where the VGA slot is at the end of a flat cable that's appended to the side of the PCI card.
I currently use a VGA monitor, so that means both my free PCI slots have now been taken up. This isn't an issue for me, as I have no other use for the slots. The PC itself has 8 USB slots already, so I don't need a PCI card to give me more; and I don't use the PC for full-on gaming so I don't need a dedicated surround sound audio card (in fact, the integrated sound card already caters for Dolby 5.1).
In terms of what I bought the graphics card for, it's fulfilled that promise - hence I rate it 5 out of 5. But if you're looking for a low profile graphics card and have just ONE free PCI slot, this isn't the right card for you unless you're using HDMI or DVI.
EDIT:
I've since bought a DVI cable (a mere £1), and I've noticed some improvements, although not in the actual graphics themselves. Previously, the screen was offset to the left by about 2 inches, which meant I had to keep going into the monitor's menu to auto-set the horizontal pitch. Now, using the DVI cable, the monitor no longer has that issue - result!