Do not believe in any cloud mining provider due to the number of positive reviews. They are paid and often inaccurate, biased and opinionated. You should not form conclusion about any service from reviews. In fact this is true for all sorts of products. Paid reviews are seen in almost every service today.
As far as cloud mining is concerned, most of them dont do any mining and are actually running a pyramid scheme making them a HYIP/MLM which will crash at some point and then the site will say "we are having maintenance"/ "we got hacked" and then one day that domain gets sold off and not a trace in the internet is left except crying investors who put their money in those sites and complained in forums like this one.
Where you should or should not put your money in is not my concern but this is what I have seen being with the crypto space for some time. Legit Cloud mining is done by very few companies.
For a good idea about scam cloud mining sites you can visit :
http://www.badbitcoin.org/ The sites you listed are not yet listed in the badlist there but its updated everyday and you might want to keep a look. You will find older scam sites there as well. So its a good tool for reference and research.
