VB5 is able to be modified just as vb3 and 4 are. Despite the fact some say it is buggy, I on the other hand have a different opinion and my vb5 site runs very stable with quite a bit of mods. The latest version 5.1.7 is solid. It's true there are not a lot of mods available for vb5, but that doesn't mean it's not possible to modify or even that difficult. A developer with CSS, html and php skills can quickly grasp how to do the modifications. Here are a couple mods on my site including a multi-column grid layout of sub-forums in my tech/info forum with custom forum icons and flip panels with forum stats and last post info/links on the "flip" side. The other is a double post bit with user defined info fields on the right. Vb5 also has a responsive design to show well on mobile devices. You will need to use a separate mobile style with vb3 and 4(included) to view on small screens which is really also no big deal either way. Some people prefer the mobile style in vb4 over responsive design because it loads much faster. When you purchase vb, you get access to all three versions, so my advice would be to install vb4 and vb5, test them both out thoroughly and make an informed decision based on your experience with both.