I use lucidity boots quite a bit depending on the situation. As Ahri for example, it is quite nice to have the flash back up and ignite/whatever before the enemy gets their stuff back. I literally just used them yesterday and had 40% cdr in 2 items and did not have to worry about a third cdr item for a while (it didnt last that long) and allowed me to build Morello instead, or deathcap which increases my damage more than sorc boots and possibly Zhonyas. If I am vs a more tanky team that is known for building mr... or if we are a near full magic damage team.... sure. Sorc boots are nice.... but that can be done later on and you can save that 200-300 gold for another item.
Swifties I much prefer over Mobis because I do not like feeling like I have been slowed by literally even a caster minion. It is more consistant and is the second fastest boots still (fastest when in combat) and reduces slow effects on me so I may move just that bit faster.
In short, Lucidity boots while more situational are still quite good and they are cheap. Works great when you know you use your summoners a lot. Swifties is a personal preference and I do not feel it effects very much unless you are needing to get back to lane faster or unless you are a jungler.
Is that to say I would object to a little tlc for them? Not at all. Would be nice, however the item cdr would make the glacial + ingenious hunter + commencing stopwatch + 5% maxbreaking cdr even more attrocious. I do not use it myself, however I know that people are able to spam the items quite a bit already. Would make the boots more often used though.
