So, if you find a website's ranking go up fast and then stay in the #1 of first page, normally this website is successful, but the professional seoer will watch its ranking for about one month, it's hard to say what kind of seoer did this work, maybe white hat,who just do health back links, obey Google or other search engine's rule. maybe black hat, who just want to get ranking ASAP, and do not care be punished by Google or Yahoo, Bing at all.
One month is the period can detect anything normally, If this site done from the search engine, that means this website is punished by search engine already, it's also very hard to did rank again, the owner will abandon this domain. If this website can stay on the #1 position, that means this seoer is good guy, or this keyword has low competition.
There is a kind of seoer i want to be, it is go up slow, but never drop! and the good seoer knows how to did that, and not everyone want to share it, i am one of them.
Check my keyword discount housewares for http://www.uniwarestore.com, today is no ranking yet, but it will stay on