Hi,
I use both. MW office is much easier to learn, much convienient user interface. But Genesys has some wizards to design circuits. So you can use these wizards, and can go to MWO to compare the results. Sometimes, Genesys gives wrong results. For example, I designed a filter at center freq...
I have the same problem. For high pass filter, I have to use series capacitor. This capacitors cannot be implemented using distributed elements. Therefore, we have to use lumped capacitor or MOS capacitor. These days, I am working on MOS capacitor model in HFSS.
regards,
lkuzu