Really, I thought it was great for side sleepers. Hmmm I am a slide sleeper and don't have any problems. I like how it's super comfortable and really just holds in place just fine. The gel pillows that press against your nostrils felt a little odd the first few times I used it but other masks that go over the entire nose touched the side of my nose and I really don't like that. Only thing I would recommend is using the fabric coverings for the silicone frame (they come with it), for the parts that rest across your upper cheeks. It is also a good mask if you have a mustache; my last mask went over my nose and I had to keep my mustache trimmed really short almost shaved or it broke the seal.
If you need a chinstrap with it I would get a "halo" style like this from amazon because the place where the DreamWear crosses over your head is the same place other chin strips want to be and they interfere with each other.
I have used CPAP for years and have changed my mask style many times. What is comfortable for me might not work for you. I use the DreamWear Gel now, and it is the most comfortable mask I have ever used to date. I buy my masks and supplies from Amazon and Ebay because my insurance doesn't cover anything and they tend to be cheaper than a dedicated CPAP supply store.
Sleep in an elevated/sitting up position, wear a chin strap if you can tolerate it and flush your nose with saline to promote more airflow.
For those of you that like chin straps, the best I've encountered imo is the sunset halo style chin strap.