If you are simply looking for a change on the scale quickly you might not get it with weight training, but if you want to see a change in the shape of your body, I think weight training is soooo important.
I weight train 3 times a week and do cardio 2 or 3 times a week. I eat pretty clean (a very important factor if you want to see results). I am having a slow steady scale change, but more importantly, I am seeing a wonderful change in my body shape. Muscle definition, increased strength (which helps with my cardio work) and killer posture. I used to focus on cardio, but I now spend more of my time lifting as heavy as I can and for me (you might be different!) this has been producing better results.
You can do a search on this and will find that the folks here mostly try different variations of WT/Cardio to find what works best for them.
I don't have the Gym Styles yet - I can't wait until these are part of my collection!