Bit 49, and miners.eu both seem like scams, or fairly new businesses, I wouldn't trust either with my money, especially if are buying fairly expensive mining equipment.
I believe Omega was referring to this thread -
https://bitcointalk.org/index.php?topic=5145072.0. Look at the first post, looks like they have a fake team and looks like a confirmed example. The only positive comment is likely by an employee of them.
Teslawatt looks legit, not 100 percent sure though...
Teslawatt and bit49 are not scam - i have used both and both they are not scam but they are bad.
bit49 dont give you access to miners, miners are overpriced in my opinion and even with the low price for electricity in Russia the ROI is very poor.
It is better to buy more efficient miners than to mine in Russia and take the risk to lose miners. Miners are old and with bad quality they try to compensate you when the miner is damaged but overall it looks bad - i have never had so many problem with other S9 miners hosted elsewehere
Teslawatt give you access to miners which is good but they have practically no support - i have send more than 10 emails to their tech support and get only generic reply that they will take a look and then nothing happens - i finally gave up.
Even the worst web hosting companies use a ticket system where you can contact support and reply to tickets - both of the above asic hosters dont even have this or you dont have access to tickets.