Hi, the round trip fee is $2.22. Liquidity is fine in the first few hours of US session which I'm trading. More info can be found on the CME website for volumes etc. Price per tick is $1.25 and the reason you would chose this instrument is because you don't have much trading capital and are new to futures.
A good starting point so to speak. The ES is a whole different beast, I'm not able to speak about it as I have never traded it but you need a lot larger capital to start with as just the contract holding deposit is significantly larger, not to mention the cost per tick size.
The CME website is very informative on all you need to know about all the instruments with 15 minute delayed quotes in current time so worth a look for further education.
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