Have any of you readers used either of these:

IISTracer

WebChecker

At one point WH4L sent me a trace from IISTracer which helped me identify a problem on my site, not caused be me or DNN!

I have been using it since to good effect.  However it is drawing close to the expiry of the evaluation period.  I am considering a purchase but before doing so I would appreciate comments form any that may have used these tools.

Declan

Update:

WH4L were using an eval version.  They are going to purchase and register!  This means I will still have the benifits but no cost