I'm using Titler Pro 6 with Vegas Pro 17 and I wouldn't be without it. Admittedly, it has it's quirks and it works better if you have two monitors but, once you get used to it (and it's quirks) it can make your videos look very professional. I use a lot of lower thirds in my videos and it's ideal for these. Over the years I've learned little tricks to speed up my workflow. I should stick with version 5 if I were you, I don't think you get much more with 6. Version 5 has multi-title management and elastic timeline (I think) and these two features, in my opinion, are the most important. Keep at it, you won't regret it.