I have four boys 2 to 3 years in age roughly, weighing from around 1150 grams to 1400 grams. Taking about 4 to 6 jumbo mice a piece per month (and still putting on weight). if your want I can post exact ages and weights. I feel they're doing fine. I had a few boas in the past, that I switched no problems. But cost wise through any of the big rodent places I'd only be saving a couple bucks a month switching. Even though I'm not really against eventually switching, I've even been considering it. But so far, it's working out great for my situation.