The 15-22 is great for practice, so long as it isn't your ONLY practice. Cheap to run, easy on things like shoot houses what not to love? Remember to do some real practice with center fires as well though.
Agree....... .223 ammo is down to more reasonable prices now so its not so painfull to break out the AR. I saw Federal 55gr FMJ in recent days for .34 per round.