I have two Steripens (Adventurer and Journey) and am happy with both. I absolutely LOVE the ease and how little time the whole process takes from start to finish. Fill a bottle, grab your Steripen, stir for 90 seconds, dry sterpin, put away... be on your way. Last summer my dad borrowed my Adventurer and reported that because it was so easy to use "on the go," he ended up drinking more water, which is great.
Yes, seeing the LED light on the Adventurer requires a certain angle and attention (it is dim and shade helps), but it's never been a big deal. The Journey is heavier, but it has a smile-y face :) When the water is mucky, I filter with bandana first.
I DO actually think it's important to keep fairly steady eye on the LED while you're treating. The reason being, if you're not paying attention, it's not that hard to unknowingly lift the Steripen so it's not satisfactorily submerged. Just a mm or so could make a difference. When this happens the little red light goes on or something flashes (don't remember as I haven't used it since last fall!), but only for a short time. So... when you look back down (after what feels like 90 seconds) and everything is dark, you can't be certain whether 1) you missed the "okay" light and everything is good to go, or 2) you messed up, it turned red, and then shut off. Big difference. This can be frustrating, and I've always just started over to be safe. To avoid this, I try to keep an eye on the LED and also use my watch - this helps avoid any second guessing.
Thumbs up for the Steripen for shorter trips.