I use Wave A LOT and it saw its share of beatings. It's not to hard to open but handles can be twisted a bit if they had to.

Swiss tool becomes my second favorte. In order not to look like a xmas tree I leave Wave on my civilian clothes and my duty belt has Swiss Tool on it. Swiss Army make a heavy duty tool (solid) that can take abuse and my biggest complain is that there is no one handed opening for the blade (at least one). But all the tools lock outside which is really nice.

Matt