Used RSForm (free extension) and was so impressed, I purchased the RSForm Pro! version - sooooo versatile! Support was exactly what someone wants when their in a rush and needs solutions quickly. I wanted to make some slight modifications and developers were not only quick to reply, but great at gathering requirements and implementing change requests. The whole process has been great! Would definately use their services again, will most certainly purchase this component again for future clients (it is so versatile) and would highly recommend to others. PS. have had no problems with Joomla 1.6 (I think that this is worth a note). Looking forward to trying out some more of their components.