thanks dennic.T for the advice. my work is 75% indoor and 25% outdoor. hardly go swimming (or diving) in the sea, occasionally do some kayaking, hiking, travelling. the sub looks rugged but if one is never going to plunge into sea, then what is the use. the other question is whether you are actually going to dive or snorkel with your sub. pricewise i think it is about par. i just need some expert view on the practicality of owning one or the other. do not want to spend so much money and then regret the purchase. thanks again.