Alterkations are nice, but at $4000, is a very expensive change out for imply a steering upgrade. For a street cruiser, similar feeling results in handling can be made for around $2000 using Hotchkis or Firm Feel parts. IMO, the best reason to use an AlterK is for less weight or then ability to quickly change spring rates.

If your buddy is willing to drop $1300 on the steering, the Borgeson box is well worth the upgrade over using a UNisteer R&P.