Cellphone Based Data Providers Recommendation

We've been using Roam Mobility for the past few years, probably since they started their service. I like it since their rates are in Canadian dollars making it more affordable. I used to just get their Talk/Text plans and use StraightTalk for data via a MiFi. But like Lenny K, I found we went through data way too fast and it was expensive at $10 US/GB. So last year I went with RM's Talk/Text/Data plan which gave me 4GB/month plus cell phone use for $50 Can. Having had T-mobile years ago, I was worried about data coverage but I found that TM has drastically improved! We had data almost everywhere we went. This year I went with RM again and got in on their 6GB/month plan. Even though we only down for 4.5 months, I paid for 6 months to get the extra data. Hopefully I can avoid having to go to StraightTalk again. There are negatives though with RM. Their customer service sucks. You cannot talk in person with anyone, only by online/email messages. And no matter what you say, your first response is only links to their FAQs. Further response takes a while if you ever do hear back from them. Another issue is you cannot buy more data if you run out. You have to buy a whole new plan.