If you need a good tropical water wetsuit (80-85 deg. F) then I highly recommend a "surf" wetsuit. The neoprene in them works just fine for diving and they're usually cheaper than a "scuba" wetsuit. I have a $90.00 Body Glove Method 3/2 fullsuit that I use for places like Cozumel that has about 30 dives on it, mostly to at least 100', and I don't know how many surf days, and it still looks new and keeps me just as warm. The problem isn't the neoperene in these suits, it's that the least expensive ones are not exactly made of the highest quality materials (hence the cheap price) and they tend to wear-out after only a couple of seasons where your BC straps rub.
The Roxy will work fine for the waters it's going to be diving in. But no wetsuit, from the highest price, to the lowest price, can work right if it doesn't fit right. The suit should fit "snug" but not be uncomfortable. If it's to tight it will be uncomfortable to wear. If it's to loose, it'll be useless in keeping you warm.