I'd ask myself if I were more worried about being dead or about a bullet penetrating a wall.
Generally, frangible ammo designed not to penetrate walls doesn't penetrate flesh very well either; thus, having inadequate ability to rapidly incapacitate a threat.
Glaser blue generally penetrates 5-7 inches in ballistic gel, while the Glaser silver penetrates 8-10 inches.
Neither penetrates the 12" minimum of the FBI protocol.
You could do just as well at "in apartment" distances with an inexpensive shotgun loaded with #12 or #6 shot respectively. Neither of which should be recommended for personal defense, BTW.
http://www.firearmstactical.com/imag...m%20Glaser.jpg
Save the bird shot for fragile little birds.
I don't think any PD is using Glasers anymore, BTW. There's a reason for that.
Also, don't assume the Glaser WON'T go through a couple of walls. I've seen tests where it did. It actually went through walls better than flesh. So, to top it all off, they're inconsistent performers. When they "work" they don't penetrate enough. When they don't, they penetrate way more than the reason you picked them in the first place! It's a lose/lose situation.