It is difficult to say with in being a new kit.
With regards to the Omega kits, Fountain Pens outsell Rollerball by around 25%. Most people buy in 5's but consideration needs to be taken as 5 Omegas my cost £32 but 5 Alpha will most likely cost around the £50 mark.
I am currently working on the figures for a deals on 10s and 20's.
What would people think of the idea of initially only offering Fountain Pens and introducing the rollerballs a month or two later?