Using Graco Size4Me 70 convertible car seat... but only started using when lo was ard 7 mths. before that was using carrier (travel system stroller)...
although a bit on the pricey side, like the fact that safety-wise, it can rear-face until lo is ard 4yo & the front face til lo is ard 7yo. the years you get out of it is worth it.. also, the chest clip is a plus as I think without that my lo would've climbed out (did that in a 5 point harness stroller! )