Leisure Bay is the "house" brand for Rec Warehouse. They also sell the spas to dealers across the country where there are no Rec Warehouse stores.
I've had dealings with both the spas and Rec Warehouse. I would hesitate to say that either has much quality behind them. The spas seem to me to be cheaply built, poorly insulated and not backed strongly by their service.
A hot tub dealer I dealt with in the Houston market brought them in as a cheaper line to offer to go along with his other higher end spas. After having them on his floor for a couple of months, he threw them out. He had warranty issues right off the bat and got no service from the mfg at all. He had leaks, cracked jets, non-working lights, etc. He got fed up and got rid of the spas.
I've also heard stories on the lack of energy efficiency. They have virtually no insulation. They claim to use the thermopane method, but they don't do it right.
I'd stay away if I were your brother. Look at some of the mid-level spas from the top manufacturers. They will have choices in that price range as well. When he looks at these spas and doesn't see as many features, tell him to keep in mind, the features all have a cost to them. If they are throwing in a lot of features, how do they get the low price? Something else has to be taken out - and in the LB case, it is quality manufacturing.