The answers to the two questions in your last paragraph are yes, and yes.
The monitor has been generally well-reviewed, but your sons should be aware that at this price-point you aren't going to get top of the range response times for gaming.
OnePlus 5 review
Alice Saey's mesmerising animation for Dutch singer Mark Lotterman
iPad Pro 10.5in (2017) review
Comment booster votre iPhone ?