We did the Columbia Glacier daytrip and were fortunate enough to have a sunny day. I would not want to do this trip in the rain (they go rain or shine), so wouldn't recommend booking it far in advance. Wait until a couple days before and pick the day with the best forecast. The best place to check weather is http://pafg.arh.noaa.gov/zonefcst.php?zone=AKZ131. This is the marine forecast for NE Prince WIlliam Sound, and it is much more accurate than what you'll find on weather.com or weatherunderground. We waited for a date with a 'mostly sunny' forecast. We had a great time and the forecast was pretty accurate.
I would give them 5 stars, but I think it is a bit overpriced (their only competition charges the exact same amount for this trip, hmmmm). At $229 this was our most expensive excursion in our 2 months in Alaska, and we did quite a few. It was even more expensive than a Denali flightseeing trip with a glacier landing! (also more expensive than a guided fishing charter and two other glacier cruises we did). But, they had plenty of takers (including us), so I guess they know their market.
The guides were great and they keep the groups small. Our group was 3 tandem kayaks (5 people + 1 guide). They had two other groups out the same day with similar guide ratios, but they were so far away we really didn't see them.
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