Observation- One potential drawback to rapid leveling (as fun as it can be) is that character level and magic item alotment can easily get out of whack. In a game like D&D, where magic item development is actually mathematically designed into the challenge system, that could be an issue.
There is a variant rule about scaling 'inherent' bonuses to attack and damage that replace the enhancement bonuses from items, thus removing the math from the magic...this rule is supported in the character generator, in fact.
Alternatively, as long as we have periodic access to new lootz, it should be manageable. Just be aware, in general, if we're overdue for a lootdrop while assigning encounters, as we'll be behind the power curve for our level if we are.