The jury is in - I have tried one, and I love it! I have embraced the romper and the flashbacks to my youth that come with them. They are an instant outfit and can help you look pulled together pretty quickly.
One of my favorites shown here is from Splendid. My girlfriend had posted about the fun prints that they had in store and of course I giggled when I saw the zebras. They are so whimsical! I have paired them with these Dolce Vita nude booties so they wouldn't distract from the print and a nude clutch from Louis Vuitton. Here and here are a few other rompers that I love.
Another embrace has been the jumpsuit and the tailored overalls. These wide leg overalls are from Zara and were everywhere last fall. I have used them in the transition to summer pairing them with crop tops underneath or shown here with a simple black tee. This was my "French Country" look with a little neck scarf and some cat eye glasses from The Row. Its a little painterly, but i went for it and channeled Bob Ross. ;)
Since this shot I have purchased 2 other jumpsuits and worn them on rotation. I love the ease of them (well... most of the time) and how they are quick to dress up or down. Here and here are some jumpsuits that would be a great addition to the closet and have a the appeal of dressing up and this one from H&M is just an easy jersey.
Have fun and embrace the onesie!