The Syncros DPS 32 rim is designed to take everything the average hucker, DHer or 4X racer could throw at it, thanks to a pinned and sleeved construction that Syncros call True Track Technology.
All rims are individually checked for roundness and trueness, so if you don't build straight wheels with these rims, it's down to you, not the rim. Weights are ballpark 685g for the 32-hole model and 730g for the 36 holer (the benchmark Mavic D729 32-hole is 675g) so they're not lardy.
There is a 24in version too, and we like the full sleeves on the nipple beds that stop you losing nipples inside the rim. We've used these rims built nice and tight on two different hubs and never been given any cause to moan. They don't mind being slammed one bit.
One thing we did notice is that tight fitting tyres slipped into place a bit easier on the white painted surface.
There are lighter rims out there but they need more looking after. For most gravity orientated riders this is a great choice.