The V-22 is a great tandem rim at a great price that's perhaps the only tandem-specific rim made today. However, the low-volume sales means limited colors (i.e., one - Silver), only two drilling options and the profile is semi-aero like the Fusion. It's very much middle of the road in all respects and is probably best described as a cross between the Fusion & Mavic A719.
As for Velocity rims, I've been using them since 2000 on mountain tandems (Aeroheat AT) and on our road tandems since 2002 when I discovered Mavic was no longer producing the CXP30's that liked so much. On the bright side, the Velocity Deep-Vs had the same profile but cost about 30% less and weighed about 15% less. Needless to say, I've been advocating Velocity's rims because when everyone else was abandoning the tandem market they made a conscious decision to jump in with both feet and continue to offer a wide range of rims that are suitable for use on tandems. Well, that and they have proven to be excellent rims.
Just for kicks, here's a potpourri of the 700c road rims that you'll find on a lot of tandems... Sorry, no details regarding FIR rims because I couldn't find any....
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Velocity Aerohead @ $65 MSRP = Too light for a tandem wheel unless you're a flyweight team with good roads.
700c ERD = 602mm, Weight 425g, 20mm x 21mm, 14 different color choices & 9 different drillings including 40 & 48.
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Mavic CXP33 @ $85 MSRP = a mere shadow of the CXP30 but about all Mavic has for a tandem performance rim these days.
700c ERD = 596mm, Weight 470g, 19.6mm x 23.5mm, silver or black & 28h, 32h or 36h drillings.
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Velocity Fusion @ $72 MSRP= Sweet spot for lightweight tandem rim used with narrow tires.
700c ERD = 591mm, Weight 475g, 19mm x 25mm, 19 different color choices & 7 different drillings including 40h.
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Velocity Deep-V @ $72 MSRP= Same as Fusion, but 17% deeper and 9% heavier for a slightly more robust wheel.
700c ERD = 582mm, Weight 520, 19mm x 30mm, 16 different color choices & 9 different drillings including 40h & 48h.
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Velocity Dyad @ $65 MSRP = Touring / Tandem-specific rim made for wider tires but still quite robust despite the light weight.
700c ERD = 596mm, Weight 480g, 24mm x 22mm, black or silver with 32h, 36h, 40h & 48h drillings
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daVinci V-22 @ $55 MSRP = Super robust, do everything all around tandem rim at a great price.
700c ERD = 594mm, Weight 560g, 22mm x 24mm, silver only in 36h or 40h drillings.
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Mavic A719 @ $75 MSRP = Traditional modified box-section 'trekking' rim with eyelets, preceded by the ever-popular but problematic T217.
700c ERD = 594mm, Weight 560g, 24.6mm x 19.8mm, silver or black only in 36h drillings
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Sun CR18 @ $45 MSRP = Dirt cheap, time-tested box section trekking / tandem rim for narrowish tires.
700c ERD = 612mm, Weight 484g, 22.5mm x 15.5mm, silver only in 32h or 36h drillings
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Sun RhynoLite @ $30 MSRP = Dirt cheap, time-tested box section trekking / tandem rim for larger tires
700c ERD = 612mm, Weight 565g, 27.5mm x 15.5mm, black only in 36h, 40h or 48h drillings
Same profile as CR18, just wider. There's even a Rhyno Lite XL @ 29.5mm for really wide tires.