Yes, you will lose the link a few times a dive, especially if you dive with your hands crossed at your waist as many of us do. The connection simply doesn't work through your body. As for camera flashes, I use a camera all the time and have never noticed link issues while using a strobe.
No, it's not a big deal as it ALWAYS connects as soon as your hand comes up to look at your info. It really only takes about 1-2 seconds to connect again when it disconnects at all. Most of the time it doesn't even disconnect. All of the wireless computers I have used have done this from Suunto to Aeris. It doesn't matter what make or model.
All that said, if I had to do it over again, I would have saved over $400 bucks and just bought something simple, reliable, and cheap like an atmos 2. Not to mention saving another 100 bucks on the backup spg I bought to go with my wireless computer in the first place. Don't get me wrong, wireless is reliable, cool, and handy but when I am diving in 45degree water, with 5 feet of viz, and heavy current at 100fsw, my distrust of my wireless computer creeps in and I reach for my spg. Maybe I'm just the paranoid type but stress underwater does manifest itself in strange ways, lol!
A few other things I don't like about going from a console to a wireless wrist unit is now I have three pieces to watch out for (spg, wrist unit, and transmitter). A wireless unit has to be handled with care as it can break easily. Just wait until the boat DM grabs the transmitter unit while lifting your gear into the boat in Coz and it shatters. Two batteries now to keep track of, more failure points...
Some positives include being able to take my wrist unit to lunch but that can be done with quick disconnect consoles and other non wireless wrist units. Having my air info on my wrist isn't really a major plus as I dive more, especially when I reach for my spg for comfort. I'm trying to think of more positives but the only real positive is it's cool? Will I sell my computer soon? No, I have it now and am happy with it, as long as I have my backup spg. Enjoy and good luck with your purchase. The good news is you will have fun diving with it no matter what you choose!