We have been using JProfiler for the seam performance investigation. It is a resource hog - but what profiler isn't ;-)
Overall it have been very nice and provides a lot of in site into what is going on - it includes IDE integration, and remote profiling as well. The thread monitoring and CPU views are particularly good. I have not used the memory profiling aspects, but have heard that they are good as well.
Thanks I will probably get a license for JProfiler.
What isn't a resource hog now days? Good thing resources are generally cheaper than developer time. :)