This was my second time at RM Seafood, but first at their downstairs (more casual) spot. After my experience upstairs I had no desire to come here again but the wife wanted to give it another try and it changed my opinion for the better. We had our kid with us and they didn't seem to mind. Of course they sat us on their "patio" in the hallway overlooking the escalators to Mandalay Place, but that was understandable. The inside looked too quiet for us anyway.
There's no kid menu, but they were happy to make a plain, grilled chicken breast for our son. He deemed it the best chicken he's ever had. At $17 for a kid-sized portion, it better be.
Our food was excellent all around. The half dozen Kumumoto oysters ($23) were meaty, mild and delicious. My wife's order of steak tartare ($21) and ringo roll ($24 / spicy tuna, apple, jalapeños, tuna, cobia, spicy garlic ponzu, kabayaki sauce) were nearly flawless, albeit expensive even for the Strip. My black cod ($32 / bok choy, candied kumquats) was one of the best pieces of fish I've had with its flaky and fresh meat, cracker-like, crispy skin, and delectable sauce. Even the cornbread and crackers in the bread basket were great. The cornbread, by the way, came in handy for soaking up the sauce from my dish.
I'd be happy to recommend this place now. But bring a fat wallet because it's not cheap. Some might even complain about portion sizes, which lean towards the smaller size, but I wasn't looking to stuff my face silly this night.