I live in Costa Mesa and work in Gardena and a detour past Bluff Park only adds 3 miles to my trip home so it's my usual "after work" slope venue. It's rarely
unflyable but like others have said, the lift is often light and variable. During typical SW to W wind conditions it's in the turbulance from the Palos Verdes Peninsula and I've seen it dead and unflyable there when Fernin to the north and Dog Beach to the south were ripping.
But with a S to SW wind Bluff Park can really come alive. It's not known for "big slope" lift and I don't think it would ever support the 60-100 oz. molded missles they fly at Fermin but it can be a blast to fly with everything from combat wings and EPP planks to scale planes with light to moderate wing loading. At times those planes will really sizzle there.
The thing I like best about Bluff Park is the aforementioned mowed lawn at the top. The slope face also lends itself well to downed-plane recovery and there's a vast expanse of sandy beach between the slope and the water so it's my favorite place to maiden and trim out new planes.
Finally, the regulars are a pretty good bunch of folks.
Back Bay, Reef Point, and Dog Beach are all within 8 miles of home so I don't typically drive all the way to Long Beach to fly on weekends. But when I can get away from work early enough (a rare event these days

), you will often find me flying the evening lift at Bluff Park on weekdays.
Pete