We needed some Grobags for our newborn son and a mixed pack of 1 and 2.5 Tog, at a great price, was the obvious choice. We have a warm house so we have not used the 2.5 Tog yet but as my son has plenty of leg room at the moment, I am sure we will get use of the heavier tog during this winter.
We purchased the 0.5 Travel Grobag too - this has a front zip which makes it very convenient for changing nappies throughout the night. I unzip it before I lift him from his cot, then put it behind his back and head on the changing mat - this means I do not have to fully remove it, there is no bulge under him and he is not in direct contact with the cold changing mat which usually startles him. These Grobags are side zipped which are not as convenient, though certainly not inconvenient.
The design and material are good quality and the Grobag seems well made overall.
Some babies do not get on with Grobags but my son is very content in one.
If I could give half stars, this would be 4.5/5 - though it is not a travel bag, these could still benefit from a front zip.