Impucifer itself doesn't do speaker virtualisation, it is just a tool to create "presets" based on personal measurements. Those presets can be used for example by HeSuVi. If you install HeSuVi you will get a bunch of generic presets with it. However, it is very well possible that none of these presets give a very realistic out-of-head experience to you. [Edit: actually that is an understatement, it is very well possible they don't sound out-of-head at all, and totally bad.] (They didn't work at all for me.) But that says nothing about the potential, how it can sound with a good personal measurement. I own a Realiser A16 and I have used Impulcifer to create a HeSuVi preset (by running the Impulcifer Sweeps through the Realiser, using my personally measured PRIR and HPEQ), thus creating a HeSuVi HRIR "copy" of my Realiser PRIR (with HPEQ "baked in"). I didn't do very intensive listening tests, but on the surface HeSuVi with this preset sounds identical to using the Realiser (with switched off headtracking). And that does give me a very good out-of-head experience.
(The only reason why I didn't do a direct speaker and headphone measurement with Impulcifer is lazyness: I have my Realiser and PRIR and HPEQ, and making this "copy" this way is less work. I have no reason to think a direct measurement would give a dramatically different result.)