My first tank was red sea..Love my red sea tank, sump is perfect for my needs and stand is well constructed, only thing that I would note is the ATO as the valve gets easily clogged somehow even with nothing in it but water and this is somewhat annoying but not a deal breaker and can easily be replaced with a different ato. A lot of people also replace the down valve with a gate valve but I haven't had any issues with the stock one.
Good times