Instruction: Answer the given question using the supporting document.

Input:
Question: Why would one want or need a tamper
Document: Most small home espresso machines that have a built in tamper, have a crappy plastic one--if you want quality pulled espresso shots, you need this tamper!
This shipped quickly and works very well. You may want to measure your espresso filter diameter before ordering, but the 50mm size fit mine perfectly. It looks like the image in the picture. However, it has a small line down one side of the tamper, possible from the mold - otherwise I would have given five stars, but I recommend this product.
If I could do it over I would have paid for a better tamper. To be honest this is worse than the cheap one that came with my espresso machine. It is cheaply molded and there half lines left to prove it and there is a flaw on my 60m side that would prevent any puck smoothing. I don't have a need to use the 60 but if I did I would have had to return it. It was shipped in a cheap bag and was dinged a bit during shipping.
This works well for tamping espresso shots, which is all I want or need it to do. The small end fits my tiny home size espresso maker, but if you flip it over, it will work for a full size machine.
This is a cheap poorly made tamper. You get what you pay for! Save your money and use the plastic tamper that you get with any espresso machine. But you do want to upgrade, I would only recommend a Reg Barber tamper (solid stainless steel base).
I didn't think it would be as heavy so it ended up being better than what I expected to buy. This will definitely tamper your espresso how you need it!
Works as expected, bought new espresso machine and need a new tamper. Good quality product. Good for the price would recommend.
Tamps your expresso like a charm. Does not rust, easy to clean, looks great and half the price of Walmart. Need I say more? I would recommend this tamper!
For the price, this is a fine tamper. It does the job, but isn't as elegant as a pricey one. I didn't want to spend $30+ for something fancy, so this one is great.
I bought because I heard the tamper that came with my espresso machine wasn't any good and would need replaced. Well I haven't needed to replace it yet so I haven't used Terry's Tamper yet. But if/when I do I'm positive it will do the job.
Answer: Espresso needs to be packed firmly in the portafilter basket and a tamper is great for this because it fits nicely inside the portafilter. When I got my espresso machine, I forgot to buy a tamper too and I was left trying to tamp the espresso puck with other objects, but a tamper does this much more evenly than trying to use a makeshift tamper. Tamping is one of the necessary steps to great espresso shots!