Glenda, I have been using Simply Accounting since well before it was called Simply Accounting (initially it was Bedford then bought out by Accpac and Computer Associates, etc etc....) So although being extremely familiar with it and its functions, I cannot honestly compare it to anything else.
I think you can go to a site to automatically download the US exchange rates, but I don't I enter them manually from the Royal Bank site.
It handles GST PST quite well (both on sales and input credits) Actually GST is not much of a beast in my opinion, or at least Simply handles it quite well, very easy to report, etc...HST is another monster that I have not fully studied.... I only charge GST on sales to the east coast and when I get audited, I will play dumb (my sales to the east coast are not large).
Runs the G/L quite well, good payables and receivables package, inventory including controls, payroll if required and even project management to a degree.
Jeff