I like Corespace.com service. They are always quite willing to assist you with whatever issue you might be having. For instance, the other day I had a biggie: a spurious upload error when uploading files with a browser (which turned out to be a small misconfiguration on their end). It would have been a deal-breaker, as my client's entire site hinges on being able to upload files in that manner.
They helped me with everything needed. Recommended.