Nope. Never heard of them. So they're probably not that large. I only invest through traditional brokerage houses that have been around a very long time and that can invest in most anything, not only ETFs. Firms like Ameritrade, Schwab, Fidelity, etc. So no, I would never suggest going to a firm like the one you're mentioning above.

Why do you ask? And do you already have a broker?