I have received both doses of the Moderna vaccine, I did at the Lynn Institute (offices in OKC, Tulsa & Wichita) so completed series in November (paid research study), so I got 2k of free play money.
Yes the 2nd shot had stronger side effects but not too serious and only lasted half a day and was able to sleep it off.
It's not a traditional vaccine in that you do NOT get a virus or even a synthetic version, it's a totally new concept that mimics your real (RNA) immune proteins. Perfectly safe for 99% of the population, so unless you are allergic to stuff like shellfish, or certain drugs then I recommend that you get it.