Probably run bug free. I made the mistake of putting down hard earned cash for Mathcad 7.0 Professional and am very dissapointed. My last version of Mathcad is 3.0, which i'm reasonably happy with. Do a Dejanews search with Mathcad to hear some of my reports.
Mathcad 7 also has a link to a private talk group run by Mathsoft,... sort of like a newsgoup. I don't remember seeing any good comments about Mathcad.
The only reason I use is is because I want to see the math like I write it down so that I can do a quick and dirty calculation, and then cut and paste into web pages to share with other engineers.
Other mathpad calculators are not as quick and dirty wysiwyg as I understand it. Walt