Depends who you ask. I've used them for about 5 months now and they have made every payment (every weekday except for bank holidays) and at the end of each 120 day term I have received my principle back. The website is clean and looks good. Their customer service is prompt and they have a facebook group in which several of the employees respond to questions and comments daily. They have also sponsored multiple major bitcoin conferences and are currently part of a cross-country (USA only) promotional tour. They are also planning to undergo and audit near the end of August, carried out by a London accounting firm (the CEO is based out of London). So yes, I think they are trustworthy.

If you look around the forums, you will see a lot of people calling them a HYIP scam, but in my opinion, most of these people have not actually investigated the website too closely and think the daily return is too good to be true or they are trying to promote some other competing website.

If you have any other questions feel free to PM me. I feel like I shouldn't be clogging up this thread.