Clear is HORRID for me and has been ever since I started using it in early 2011. The only reason I've stayed with them is because I was with a roommate temporarily and didn't want to have to pay for something installed (Comcast) just to move and do it again. Since then I've moved but stayed with them as I'm awaiting Google Fiber (soooooon ...) but it has been torture. There are very few times that my speed is higher than 300 kbps and I'm maybe a mile and a half from a tower. It's been a complete nightmare.
Using the series M modem.
