Yes and no.
Reflex sights are prone to washout in direct sun. That is, there are conditions under which a reflex sight will have lower visility of the target dot/chevron/point/whatever. ALL reflex sights suffer from this, though the degree will vary with quality. AFAIK, even the best reflex sights will be hard to see under certain light conditions. Tube sights, with the dot shadowed by the tube, don't have this problem (though you may have to adjust the brightness up or down).
Reflex sights TEND to be more delicate than tube-type sights, owing to how they are constructed. There is heavy variation in this, though.
Which is best for you really depends on what you're using it for. If you honestly need this thing to behave like a military-grade sight, which can be banged around, dropped, dunked in water, sit in the rack for years left on and still work, there is one option: Aimpoint. If I was intending the gun to be used as a weapon, this is the way I would go.
However, if you are just intending to use this gun as a plinker, sport shooter, fun gun, game gun, hunting gun, whatever (read: everything else besides "weapon"), there is no need to drop that much money on a red dot. There are a lot of really good reflex and tube style sights out there that will work just fine for a fraction of the cost. And, if something goes bump in the night, they'll probably work when you pick up the gun.
Mike