Are Sicily by Car and/or Centauro Rent A Car Reputable?

I've used Sicily By Car in the past. They're ok, although their cars sometimes were old and smelled of stale smoke. But they were cheaper. A friend of mine got a new car that got a flat--I think he curbed the tire-=and they were not helpful, didn't sed a replacement. I helped him limp to a tire store and he bought a replacement.

Sicily by Car is reputable enough. I’ve used it with no issues.
Centauro is a Spanish rental company that has been around for several years (since the 1970s I think). They are big in Spain but their presence in Italy is recent (no more than 5 years) and limited to a handful of places. I have no experience with them so I can’t comment on their service. Check some Spanish travel forum to see their reviews.

Sicily By Car is ok - the counter lines are tedious sometimes. I would avoid Centauro -they are fairly new to Italy, yet the complaints began quickly. They are a Spanish company where they seem to have a below average reputation. This Italian report was eye-opening: https://www.tripadvisor.com/ShowTopic-g187849-i143-k11534348-Centauro_rent_a_car-Milan_Lombardy.html#91694957

Another option is to use Kemwel. I have used them multiple times and have found they are reliable and helpful if you have problems.
I feel their plans are easily understood and self explanatory.

I rented a car through Sicily by Car last spring out of FCO and had no issues what so ever. I believe they were the cheapest by far.

Thanks for all help!