I don't own one, but I can make three assumptions based on it's specs:
1. First off, they crammed 4Gb of space into a 1Gb sized drive. This means more chips per area, which means a higher probability of failure.
2. The dual-channel thing may be true, but data read/write rates are probably not going to be significantly faster. I would say it may be a bit better than a normal flash drive, but not really worth paying extra for.
3. The cap seems to just pop off, you will probably end up losing it...
Like with every flash drive, or every drive, you should be sure to keep backups. Flash media is very prone to get broken because of the abuse it usually goes through, which is why I never spend more than $15 on a flash drive.