I love both maclaren and pliko. (have both)
There is a huge difference between XLR and VOLO. XLR is a laxury stroller for both parents and a child(reclines for naps, wonderful sun canopy, leg extender for babies), car seat can also be snapped in. Now it is not too heavy, but it is not as light as Volo. Volo is very light, very compact, however seat does not recline at all, and sun canopy is not that good(we had one and it worked for our 4 year old for a run to the mall or something.......but not every day when kids were babies) The only downfall for XLR it does not have a tray in the front(my kids loved having their snacks/cups/toys in the tray in front of them. However they sell one on ebay now that fits all maclaren strollers(it's $30 though)
The only difference between pliko and p switch is that you can turn the seat towards u in the switch. It's great for babies but by the time my kids could sit up they wanted to see the "world" .
Pliko is wonderful, you can use a car seat with it, it's plush and comfy, great sun protection, great recline for naps,it has leg extender, handles extend too for taller parents(my hubby is 6'4 so he loved that:)), it has a very convenient one hand compact fold and has cup holders for parents and a tray for kids!!!!!!!! It also has a little step in the back where older kids can catch a ride(can be useful in the future:))And comes with rain cover(i think) The best part we found ours in great cond, only couple years old for under $100 on craigslist.
However I still like jogging stroller for powerwalking, but we too found ours on craigslist(dreamer design is my fav:))