As far as I know, the xi kit has not changed since I purchased it (which was when it first became available). This means that the lever has almost the exact same proportions as the stock lever, which will afford you no difference in throw, only in feel.
As far as installation goes, you need to drop the transfer-case-end of the transmission, as well as the exhaust in order to get at the shift lever from below. Figure about 3-4 hours if you've never done it before.