Hi Suhas,
I have been working with Jaspersoft in various customer projects in the last 2 1/2 years and I have to admit that the performance is not always optimal.
Still, has I see several customers running their complex reports in a reasonable time, I am convinced that with enough hardware you can get Jaspersoft fast enough.
More relevant is the issue of the web based domain designer: It has not really changed the last years and could profit from further usablitiy improvements.
Apart from this, I have used it to create several nice data cubes and cannot say that it is not possible to work with - of course some training makes sense to avoid a steep learning curve.
Any insights into other reporting platforms are welcome
Regards
Georg