Had a few teething problems (even though between the three of us we have over 15 years of experience living in Japan) mainly with what type of pass to get. No help at all from the ticket staff. They wanted to charge us 4000 yen each for an hour on the slopes! The Happy 7 pass gives you access to 7 resorts but you're stuck at 1 resort for a whole day.
Daisen is the most popular destination from Kochi and other parts of Shikoku but I would like to warn against visiting Daisen, especially since there are respectable resorts in Northern Hyogo about the same distance away.
There is no advanced terrain, the layout of the lifts is terrible and the hills are crowded.
Strangely, bus tours from Kochi to Daisen are always full but tours to other places are often cancelled because of lack of interest.