Canon Ef 75-300mm $150 Worth it?

heres one i took yesterday arvo in lowish light....for the money it looks ok to me

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From the problems i have getting reasonable shots out of this lens i'm curious how the IS version would fare.
As i mention in the notes to the f5.6 bird pic-the shutter speed was 1/2000.There were no excuses for unsharpness due to camera shake...
I wonder if the lens is somehow 'whipping' i.e the lens is somehow magnifying the vibrations from the mirror/shutter?Just a weird theory

that thought has also crossed my mind...whether or not its what it is is another story?
perhaps somone else would liek to chime in and enlighten us?

I too fall into the beginner category, I wanted a zoom but having invested in my first DSLR didn't have the money to spend. I am more than happy with the 75-300mm III (although my technique still needs improvement ). Here a couple of shots I took:

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thanks for all of yalls feedback and pic's it helped me alot in my decision. Keep it coming!!! Yes I am from Texas. "yalls" lol

The one i currently have i got at a good price 2nd hand when i had not much money.If i was doing it all again paying new 'retail' price i would seriously consider the image stabilizer version.I can easily image it would double the amount of keepers

....but then the IS version is still the same soft optics and a sigma 100-300 f4 EX(?) can't be much more.....And the RAZOR sharp EF 70-200 f4 is not much more still.....aaaaahhhhh,h​elp!