Actually, the old Shimano wheels are a superior design compared to the Helium. It was the Helium wheelset which had a problem with spokes backing out of the nipples due to the wheel tensioning and untensioning as one rode it.
The only negative I heard about the 7700 was complaint about lateral rigidity of the wheelset being a bit lacking. Very few have come in over the last 5 years or so requiring maintenance. Of course, all low spoke wheelsets go drastically out of true if the spokes are loose.
The 7800 is a brand new design and superior to what can be found on any "custom" wheelset because it is built for 10 sp. the bearings are further out and the spokes can be kept at very high and even tension. This is not possible with standard hubsets.
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