sierrachart.com Reviews 

They have a good product but absolutely shocking customer service. They made a mistake with my auto-billing - they debited double the amount due and 3 weeks early. When I requested a refund (for what was their mistake) they insisted I had to pay a refund fee. No apology, just arrogance and rudeness, telling me they weren't there to discuss their policy and I could cancel my account if I wasn't happy. Had they apologised or been nice about the problem, I would have ignored it and left the funds on the account. But given their attitude, I'll likely make a credit card chargeback.

Sierra Chart is arguably the best retail trading platform currently available for technical traders. Sadly, their customer service is the worst I have experienced. They randomly drop support for data feeds and brokers without notice (unless you are scouring the entire forum each and every day I suppose). And they refuse to add newly introduced instruments to the platform for specific brokers - even when you are using THEIR OWN Denali datafeed. I was told to request a refund if I was unsatisfied. And upon doing this, they credited only 15% of the balance due - with no explantion.

if you are a serious trader, I would stay away from Sierra Chart and look elsewhere for a platform that will both meet your needs and offer you the level of service required to trade professionally.