Perhaps the issue with the cursor is specific combination of hardware, software, drivers, OS.....etc
All things beyond their control. If one piece of software for playing DVD's causes a fast switch issue and thus the large cursor, is it ATI's fault, or the software?
I enabled things like geometry instacing, a few different patterns of AA, AF and the ability to force DXVA and WMV hardware accleration. It has gotten me a couple times of video hangs due to codec problems, but once I sorted them it works great.
Take the average user that tries to enable it with a incompatible codec or one known to cause issue and they will cry like a little bitch about how horrible ATI is with their drivers.
Issues I have are currently.
Even with a custom BIOS the fast switch hang and video corruption still occurs with the codecs i have to use with my HG20 camcorder. I can't blame ATI for Pixelas shitty software though.
Occasional hang and green flash video. Voltage, GPU speed, memory speed, multi-monitor, Windows 7 and Vista. No difference, so I tend to blame Adobe for flash, as silverlight with hardware acceleration on Netflix is flawless.
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http://www.bit-tech.net/hardware/graphics/2006/04/07/transparency_adaptive_aa_explained/2
For ATI cards the ability to use reg hacks to enable things that are no officially supported has been around for a long time.
"It's also possible to get Adaptive AA working on any GPU that is newer than Radeon 9700 via a registry hack. This is not officially supported by ATI, and performance implications are quite large. However, if you're interested in giving it a try for yourself, please read our news story covering the topic."
Nvidia does some things differently, however I have used alot of third party tools on their cards to enable features.