The design of the Swift is excellent except that the material choice at a critical pivot point lends itself to premature wear. It kind of rubs me the wrong way ( no puns intended ) when I see the application of aluminum with high wear areas. The use of steel or some other harder material as a bushing for a steel sleeved seat post makes more sense to me, rather than just letting a aluminum post slide in a aluminum hole. If the bike was rarely or never folded, the current configuration would be fine, assuming a good fitting seat post and tight clamping levers. The re-engineering of the alum. Swift would add to the price but it may be worth it, long term. Instead, I'd just make the bike out of steel since the weight penalties wouldn't amount to much, considering the fact that most riders are at least 5 pounds from ideal weight anyway.