There are several discussions regarding DropshipDesign.com and most of them not good, unfortunately - Link hidden: Login to view
As for Doba.com, they are a relatively good drop shipping service and easy to integrate with eBay, but it is expensive. Not only does it cost from US$49.95/month â€“ thatâ€™s $599 per year - as opposed to only US$67 for a 1 year SaleHoo membership -, drop shipping also requires you to pay a small fee on top of the wholesale cost of the product to cover the drop shipper's time spent packaging and posting the item. This additional cost can make significant inroads into your profit margins and it is not always the best way to make money in the long term.
That's not to say that drop shipping is a bad idea altogether. It is a simple way to start a business, and in the long term, having some of your inventory drop shipped allows you to offer a broader range of items to your customers without the risk of holding stock.
However, the online retail market is very competitive and business owners usually need to buy a significant proportion of their inventory in bulk from liquidators and wholesalers to ensure that they get maximum profit margins on each item.
Here is a review written a few years back - Link hidden: Login to view
Hope this helps :)