Unfortunately the IMMI Go has been discontinued. But for the sake of posterity since some people still ask me... The IMMI Go and WAYB Pico weight about the same amount and fold down to similar sizes. The IMMI Go has the advantages that it fits somewhat larger kids and eventually converts to a backless booster seat (though that's not a crucial feature since travel booster seats are light and portable). However, the IMMI Go requires a top tether; it won't function without one, which makes it useless in developing countries where top tethers are hard to come by and it's also not FAA-approved.