A Paladin deathstar using this tactic is extremely deadly, I use only 2 Falchion and 2 Sword with a Staff. The WS5, S5-6, I10 Attacks will splatter anything. Against multiwound units save the Force strike from the squad and go at S5, against single wound just go with S6 and slice on dice on 2+. Another way to get Falchions really dicing is to use a Purifier squad with them and a Librarian, even a 5 man squad can throw down 25 (or 20 depending on your reading of it) attacks at the same crazy I10 and S5 or 6. You can do more than 15 wounds to a horde or around 10 to
MEQ giving you basically zero hits back, the only problem is overkilling and getting shot to hell next turn.