I haven't used the drill you mentioned, but I did get the newest
edition of Popular Woodworking in the mail today, and they did a fairly
extensive review of 14.4V drills. Their conclusion was that Makita
(non-LXT?) and Dewalt are the best of the 14.4s, but that the 15.6V
Panasonic is the "no-brainer" best choice - smaller and lighter and
cheaper than many 14.4s, with longer battery life.
Hope this helps,