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Velocity uses an OEM hub with cartridge bearings, paired spoke straight gauge low spoke count (16 or 20 front and 20 or 24 rear).
Velocity makes good rims and is a very good company to deal with in the USA. The rims are made in Australia. I don't know where the spokes or hubs are made... or what their quality is.
Deep V rims have a 30 mm profile. They are more difficult to handle in gusty cross winds. They will provide lower aerodynamic drag when ridden in still air or directlt into a headwind.
Lower spoke count makes the spokes and spoke interfaces at rim and hub carry more load. Since the load is more concentrated, there is more fatigue and durability is lower than wheels with 32 and 36 spokes.
Most cartridge bearings are for high speed radial loads of electric motors. The "seal" is not weather (read water) tight. Bearings on Shimano and Campagnolo are much better sealed and more readily available and lower cost when replacement is required. Both Shimano and Campagnolo have many more years experience in building bicycle hubs.
Straight gauge spokes are less durable than double butted spokes.
If you break a spoke on a low spoke count wheel, they often go so far out of true that they can not be ridden.... even after "emegency" spoke tension adjustments.