Hiya gang:
I have been using Impulse for a while now and I have found the following problems with Vista x64 SP1.
1. Impulse have problems with application installations. For the longest time I couldn't get Iconpackager, bootskin or LogonstudioVista working. They would get installed but running them does nothing, or causes a error saying that the app needs to be closed.
As soon as I switched to SDC and updated LogonStudioVista and Iconpackager that I installed using SDC started to work!
Maybe Impulse's Installer isn't handling file permissions correctly?
2. This may NOT be a impulse issue only: Conflict between NOD32 and Windowblinds installation (possibly related to the installation issue that I mentioned in problem #1 above). Whenever I upgrade windowblinds using impulse some actions of the installer will be blocked by NOD32. (File operations that done after the system is rebooted after an update).
To be able to install WB, I had to disable both the NOD32 service and its startup GUI. It is rather annoying.
I have been using both WB and NOD32 for years now, and only after I switched to impulse in vista 64-bit did I ran into problems like this. 
3. Minor problem: Impulse doesn't have the fine file installation path control that SDC have. For example:
If Object Desktop Apps I want the installation path to be:
Program Depot(x86)\My Stardock\Object Desktop\
I can do this using SDC by specifying the installation path for OD to be:
Program Depot(x86)\My Stardock\Object Desktop\
However, I cannot do the same if I am using Impuse
if I use the same path that I used in SDC (Program Depot(x86)\My Stardock\Object Desktop\) then the actual installation path will be.
Program Depot(x86)\My Stardock\Object Desktop\Stardock\Object Desktop\
I have not found a way around this yet, is there one?
thanks