HOLLEY SNIPER FUEL INJECTION ~or~ CARBURETOR???

Hello MOPAR enthusiasts, I am on the fence about installing the HOLLEY SNIPER FI kit that I purchased. What has me concerned is how many modern FI KITS are for sale….used with “ only 100 miles”……”used for one week!”……”like new, changed direction!” I have everything I need laying in front of me but I’m concerned for these reasons. Has anybody had a FI kit on their car and switched back to carb?? Let’s just lay it all out with no BS!! I see this way too often and can go into Marketplace or on CL and find 100 of these kits in my area for sale. Honestly, it’s how I bought my kit, used/like new! The price was right…..or was the dreams and hopes wrong?? Any help would be appreciated before I get this all together here in the next month or so! Thanks