I have been using Plum Sleeping Bags for the past 12 months now. I have the 0.5TOG, 1.0TOG and 2.5TOG in size 6-18 months. I use a varity of styles and personally prefer the size zip with the top closer buttons. My daughter doesn't lie still in her cot so these are perfect for keeping her covered during the night whether it be during summer or winter. They are quite expensive so if you can buy second hand in good condition, this would work good. I have been lucky enough to purchase them from Trade Secret from $20 - $30 depending on size and TOG rating. I don't know if I would pay full retail price, but they would definately be worth it for the quality of the product.
Great quality, easily accessable for nappy changes, great designs

I decided to buy one size bigger when she was 4-5 months to get my money's worth when the climate started to cool and it worked like charm keeping her body warm. It was slightly big to begin with but it did the job plus I no longer had to worry if she was cold at night. To this date, my 14 month old is still using this sleeping bag (fits her perfectly now) and the quality of the fabric is still in good condition (soft and smooth) and I don't use a fabric softner. I really love the designs too, super cute doggy version :)
Good quality fabric, 2 way zipper, armholes can be made adjustable (small to big), has a travel insert on the back which is handy
It is pricey but I was happy with the results

I bought two winter sleeping bags last year. Recently the filling has started to form lumps, making them unusable. It is forming lumps on the back near the neck. I am very disappointed as initially I was impressed with their quality. I will only be buying Gro bags in the future...

The filling is clumping together.

My son would kick and wiggle in the middle of the night. the blanket never stayed on him and as a result his palms and feet would get cold as ice...then i learnt about sleeping bags and loved the idea. bought a plum sleeping bag. its easy to put him in and zippit. it has 2 zippers top-down and down-up so that you can change the nappy without having to remove the bag. it also has an opening behind to put on a harness in the pram...
the design keeping convenience in mind
didn't find many patterns for boys in the store(or maybe they were out of stock)

I have bought both the Grobag and recently a Plum bag. Love both and am really impressed with the quality and feel of the Plum. The colour choices are great and my little darling sleeps so soundly in the Plum bag. I think they only come in the one thickness but will still be nice and warm enough in winter with some warm pyjamas underneath. They need to be line dried and not tumble dried which is ok as I have a couple of bags and can rotate each night. Highly recommend for little bubs.
Lovely feel to the fabric and good quality.
Cannot tumble dry. Only one thickness.