I don't use them so I can't answer.
Someone else will be along soon to put in their two cents.
What I would recommend is the 30 day free trial to the full subscription to Sellathon.
It's a wealth of information.
Here's a few of the ways Sellathon works for you:
Q. What kind of information does ViewTracker™ provide?
A. Currently, ViewTracker™ provides the following information about each visitor:
The sequential number of the visitor. (Is he the 14th visitor or the 126th?)
The date and time the visitor arrived at your auction.
The visitor's IP. (By clicking the IP, you'll see ONLY those visits originating from this IP.)
The visitor's geographical region (for example - "New York, USA")
How much time the visitor spent looking at your auction.
If the Reserve Price was met when the visitor arrived.
If the item has received a bid yet.
If the current visitor is the high bidder, a bidder who has been outbid, or no bidder at all. Also, if the visitor is watching this auction in "My eBay"
Whether the visitor browsed a category, searched a category, searched all of eBay, used eBay's Product Finder Utility, came from "See Seller's Other Items", or some other page.
If browsing, which category he was browsing in. If searching, which category he was searching in (if applicable).
If searching, what search term(s) did visitor use?
If searching, did visitor search "Titles Only" or "Titles and Descriptions"?
If user found your auction through the "View Seller's Other Items" link, and if so, which auctin did he come from?
Which page of auction listings did the visitor find your auction on?
Did visitor elect to view Auctions Only, "Buy it Now" items only, or both?
What search preferences/options did the visitor select. Some examples include: Show/Hide pictures, Sellers that accept Paypal, Price Range, International Availability, Regional Searching, Gallery View, Show Gift Items, etc.
How did visitor sort results? For example, High Price to Low Price? Ending Soonest?
Good Luck,
Donna