Millenium Bass Drum Practice Pad Pro

Pros
+ Foldable and portable
+ Pad height is adjustable so your beater hits the centre of the pad
+ Fits under the home office desk
+ Looks good
+ Might also be used as a percussion kick mount - if you tie a shaker / tambourine on it (and use a softer beater) or if you insert a separate L-rod and mount the percussion on that (might even work with a cowbell)

Cons
- Does not grip on to my thin carpet enough so it gradually slips away
- The impact that the pad takes from the beater gives it a little shake (it does not squeak though) - other non-foldable, non-adjustable designs where the pad is supported with an extra rod from behind might be more stable but for me the benefits outweigh this, and that little shake is actually handy when you use the pad as a shaker mount
- The pad might leave some red marks on white beaters

Alternatives
Kick mesh pads might achieve the same goal and they could also be used as a trigger for a sampling pad
Edit: I now use the practice pad with an OnTrigger pedal trigger to trigger kick sounds in a sampler and it works well, less noisy than a 20" electronic bass drum