I have both. The ECO .45 was my daily carry for quite a while. The recoil is typical of the breed - a little stronger than an aluminum Commander, but no worse than a Kimber Ultra. Having said that, my EDC for almost a year now is the ECO 9mm. The older I get (I've been collecting Social Security for several years) the more I prefer to shoot 9mm. The .45 has never let me down with any ammo or any magazine, but the 9mm seems to be somewhat magazine-sensitive with Federal 124gr HST rounds. As long as I run Wilson mags, the 9mm runs 100% with the HST and it will run 100% with any mag when I use FMJ ammo.