Love short weapons of any kind, but:
Had a "Choate" pistol grip on my 870 patrol shotgun. Learned pretty quick that a short stock worked better for house clearing. The short stock can be tucked underneath the forearm for added support when the off hand was needed to deal with doors and such. The stock also helps a lot for aimed fire at anything other than point blank range. For inside the house, the pistol grip works ok if you don't have to "One Hand it" to perform other tasks or don't need to use it for an impact weapon.
Savage