Hmmm.... it certainly is quiet around here. I'll try and offer up a more serious reply then. I use a Roland PD-8 as a practise pad mounted by my desk, I would have thought that 4" is getting a bit on the small side. Personally I would recommend something a little wider for someone who is still getting to grips. But that's just me.
Well I have used one from Gibraltar and one from Vincent for ages albeit the gib is a bit more computable to wear it does the job just fine.Saves on knee and leg pain! Also use an Evans bass pillow aswell