i am a ProductCenter administrator. i would have to say that it is not user friendly unless you want to invest 200K more to make it user firendly.
but back to your original question about configurations.
configurations are handled in various ways. i believe that SmartTeam will support them with a caviot. all configurations of an assembly are revised when ever the assembly file is revised. this means that if you are only editing one configuration of the assembly, the non- edited configurations will also be revised in the PDM tool with the assembly. it is always a good item to ask when inquiring about a PDM/ PLM tool, how it handles these configurations and in specific detail. you may have to give examples on exactally how you want to handle them to get your concept across.
ProductCenter does handle configurations as separate data entires in the PDM tool. i use them as such. if a design has multiple configurations, each must have a separate revision level. if i revise a single configuration of an assembly the assembly revision also gets revised (revision level gets incremented on the assembly and the one configuration). if i revise the assembly then all configurations get revised (revision level gets incremented on the assembly and all of the configurations). but this is my rule and others may handle this differently. it depends on how you handle configurations.
and ProductCenter has a new revision out to handle SWx 2008. it is either 8.5.1.9 or 8.6.1. hope that this helps all.
if you are looking at a high end PDM tool, you are looking at bookoo bucks (100-200K just to purchase). from what i have seen in this high end market, Windchill has been the most impressive player and handles SWx, ACAD, Inventor, Catia, NX and of course WildFire (pro-e) files. Workflows are very smooth to setup and use and you do not need to know how to program to use them. look into this if you are going down this road. iQ