Why is this necessary?
935696
Its a gift card.  It works. Awesome.  Thirteen more words required? Nine more now, it tells me. Okay, the end.
2254721
You need this. Period. It gives great rationales.
415023
Not necessary but nice to have.  You can do with out it ...for the price every re-loader should have one.  it is not often that you trim brass but when you do have to this tool makes it quick.
2905135
I haven't had any use for this.  I can't remember what prompted me to invest in it.  Maybe, at the time, I felt it safer to purchase.  I don't even really know what to do with it if I ever needed it.
889084
I purchased this item in the event that I would need it, it would come in handy. I haven't needed it yet so I can't comment on it still.
2949760
This is a good reference to have especially if you don't have internet access. However, I wouldn't say it was a necessary purchase since there are so many online references now that give the same information for free.
2991532
i should not have to write anything else so this is what you are gettting because you make this a requirement.
2695443
It.... Works I guess... It is necessary but does not fit perfect. Maybe it is designed for other stereo or car
498637
For what it is for, I am sure it is quite useful, but unfortunately I do not need it.  Considering what it is for I'll find use for it.
4039635
This is a valuable primary source documents text.  It is meant to be used in conjunction with other texts, though, to thoroughly process its information.
3806046
unnecessary in my opinion. i can simply look at the watch on my wrist to get speed, distance, etc. info without problem. leaving it on my wrist eliminates any concern with it falling off and i don't have to fumble with the mount when i get off the bike to run, just go. simplify your life without this gadget. i love my garmin but this is unnecessary.
3842905
I don't think it's really necessary because after I use it with the children I please sit back in the original bag and box that it came in if you take care of your product your product will take care of you
4966261
This book was requested by one of my engineers.  This was suggested by other collegues meaning it must fill a purpose that is needed.
1257946
If you are smart enough to understand this book, you probably don't need it. If you need it, you also need to buy the instruction manual, sold separately.
3129368
This appears real necessary to some one who want to learn basics
3760170
It's suitable for new shop owners. It gives a sort of roadmap and helps to avoid a number of mistakes that are quite usual in the beginning. There is a lot of information around, both on the Etsy forums and outside and a newbie needs a helping hand to make the successful first steps.
302991
This is one of those items you really do need. Love it