Always try the wallets whose private keys are known by only you. This means don't use exchange wallets for ethereum. For this you can try myetherwallet web site or mist. Both are good. I also heard about "parity" but I did not use it before.

Alright so for the following examples:

1 miner, 10 miners and 100 miners will be used.
I will be using the LTC miner as the main use because the numbers are so much easier all data used for this is from this moment and cryptocompare.
1 miner is 880 tokens / currently $880 and the miner cost is 1550 meaning profit begins at $2,430 or $1,550

Mining equipment amount   profit per day with tokens   profit per day without tokens*    total profit difference*    days until tokens & miner are paid off/Days until miner paid

1 LTC miner 504 mh/s                 $26.29                                    $24.93                                $1.36                                 93 days   or    62 days
10 LTC miners 5040 mh/s           $262.90                                   $250.72                             $12.18                                93 days    or    62 days
100 LTC miners 50400 mh/s       $2629.00                                $2523.41                            $105.59                               93 days    or    61.5 days



However mining equipment lasts lets say 2 years, (despite the tokens effects lasting for 50 and that difficulty stays the same forever and ever in this example)
How long at max would it take to pay for these tokens per tier given:
648 days from mining profits alone with 1 miner
722 days from mining profits alone with 10 miners
833 days from mining profits alone with 100 miners.

Now I personally believe and this isn't meant to sway an opinion one way or another (But if it does my WTT referral link longs for your click) that given the mindless nature behind this form of mining after 2 years most miners having at current rates approximately 635~ days of pure profit with the token would likely reinvest and get more new miners or begin mining something new.  So given that you have 635 days of pure profit even with the tokens paid for immediately at the start and not taking the long way through it and using only your profit difference to pay for the tokens -- your next set of miners would already have this price reduction in hosting costs, and if you choose to not continue mining well you've paid off your tokens 100% and your miners 100%; you could either rent out your tokens and earn a steady daily income -> calculator on the website, or sell your tokens for at the very least what you paid for them as I don't believe mining will ever truly die to PoS/Masternodes.




(I would be interested in knowing if they buy our miners from us at a point to recycle, or if they would ship them to us for our reselling pleasure)


*Profit without tokens goes up non linearly because if you host a lot of miners you do get a discount hence why the with token profit goes up linearly.

They don't send you keys, you will be able to withdraw them after the ico ends be able to withdraw the tokens to your eth wallet.