I think version 4.1 is a vast improvement. The program's design is sleeker, and the tools are more intuitive. I really like the "cover flow" option where you can browser through templates in preview mode. Another big advantage is the way you can choose photos directly from your iPhoto library. This alone saves several minutes of time per auction. More of Ebay's specialty options are supported, and the the text in the description is automatically converted to html. You can even view user messages about your auctions and reply to them within the program!

My only caveat is that the version 4.1 has been a bit buggy. Sometimes the preview option will make the program unexpectedly quit. But, I've found restarting my computer clears this up and then the program works fine again, without any data loss. I've also had a little trouble with the font size on the uploaded auction appearing larger than the way it was shown when I was creating the template. But, that's easily remedied by simply tweaking the font size to be smaller on the template and using the "revise running auctions" option on the Template menu. You can even make changes on a batch of templates, then select them all and upload all the changes at once!

Overall, I think this program is totally worth it for anyone who's got a lot of auctions to manage, and is computer saavy enough to find easy workarounds for minor issues like I described above. I like the program so much, I'm going to upgrade to version 5 today.