Still. the open source software is the best.... hahayz
Personally I disagree. Photopost is a rock solid script and well coded. I've spent many years using open source scripts and they often have lots of baggage that comes with the scripts. Most notably the amount of patches and security fixes.
Also Open Source projects are often dogged with constant changes to the development and support teams that can have adverse effects on the overall product and its direction in the market. Just as an example of that look at Coppermine or MKPortal. In my honest opinion Open Source is great for a starter script, but as you take your business or website more seriously, commercial is a must. Sure I agree that a lot of "free" software have more features... but I'm comfortable in the knowledge that Photopost scripts are still the best. Better at integration with Vbulletin than any I've seen with any other script and the PP Pro script is incredibly powerful and very versatile.
In fact we've gone from Free software to commercial and now own several copies, and wouldn't dream of stepping back to Open Source....