What is Reddit's opinion of Greententljs Barbell Collars 2 Inch Quick Release Pair Locking 2" Pro Olympic Bar Clip Lock Barbell Clamp 45lbs Weights Plates Clips Workout for Weightlifting Fitness Training (Neon-Green)?

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Update: I ordered these Greententljs Olympic Barbell Clamps 2 inch Quick Release Pair of Locking 2" Pro Olympic Weight Bar Plate Locks Collar Clips for Workout Weightlifting Fitness Training

And they fit perfectly and extra tight on all my bars

Here are the ones I got:
https://www.amazon.com/Greententljs-Barbells-Weightlifting-Training-Neon-Green/dp/B01N6A5032/ref=mp_s_a_1_1?ie=UTF8&qid=1545014123&sr=8-1-spons&pi=AC_SX236_SY340_FMwebp_QL65&keywords=greententljs+2+inch+barbell+clamps+quick+release...

you can go and buy a set of plastic clamps on amazon for like $10, something like this https://www.amazon.com/dp/B01N6A5032/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B01N6A5032&pd_rd_w=SHCkJ&pf_rd_p=733540df-430d-45cd-9525-21bc15b0e6cc&pd_rd_wg=tsMsm&pf_rd_r=3683MZ0FD377R5R2KQY2&pd_rd_r=97e2ae1e-5648-11e9-9cc9-7768f6408781

Yep. $13 and have lasted me 2 years so far:

https://www.amazon.com/Barbell-Collars-Weightlifting-Training-Neon-Green/dp/B01N6A5032/ref=sr_1_1?dchild=1&keywords=barbell+collar&qid=1619012026&sr=8-1

I'd say it depends. My bumpers tend to slide with a little tilt/shift and it's annoying if I'm squatting and I shift a little so I put them on. You can get cheap ones off of amazon like these https://www.amazon.com/Barbell-Collars-Weightlifting-Training-Neon-Green/dp/B01N6A5032/ which is what I use.

Some kinds of barbell collars might be a worthwhile design to look into. The kind that wrap around the cylinder and provide a lever arm to pretension and lock it into place(like this) would be my choice. There's also the kind that slide onto the end and are tightened by a screw with a lever in it(like this).

Figure out what loads you need to support and try to estimate the clamping pressure required.