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The best way to find out if a company is reputable is to check reviews from other customers. The most important thing when looking at reviews is to read them carefully. Reviews written by satisfied customers are generally much more positive than those written by dissatisfied ones. It's not always possible to tell how many people have left a review, but if there are lots of them then they're probably genuine. If there aren't too many reviews, then perhaps you should take a closer look at why no-one has reviewed the company yet.
When reading reviews, remember that everyone has an opinion, even if it's just "I'm happy with my service" or "I'm unhappy with my service". This doesn't mean that the reviewer is lying, it means that he/she had a bad experience. Remember that every customer is unique, and therefore each person's experience is going to be slightly different. Don't assume that someone else's experience is similar to yours, unless you know that it is. In general, the longer a business has been around, the more likely it is to get good reviews.
If you're still unsure about a particular supplier, try asking friends and family who have used them before.