After buying some EOS tokens from Exchange/from EOS website, transferring them to your personal wallet, registering them through MyEtherWallet.com, you're left with few choices to get your FREE tokens after registration is over:

1- Keep them in the same wallet until June 1st :
All your tokens will be converted automatically to the new EFFECTIVE EOS tokens. Choosing this option also validates you to AUTOMATICALLY receive your UNCLAIMED FREE EOS tokens. I repeat: DO NOT CLAIM your EOS tokens if you will not transfer them from the wallet you registered until June 1st. This is the biggest mistake most of people make thinking they have to claim them otherwise, they're lost.
This is stated clearly on the "Claim" page of eos.io website:

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"If you want to transfer the EOS Tokens before the end of the EOS Token distribution, the EOS Tokens will need to be claimed. Otherwise EOS Tokens do NOT need to be claimed. You should still, however, register a public key and private key to your Ethereum account, see how to register for further details."

2- You really want to move your tokens from the registered wallet/Sell them but want to claim your tokens before:
In this case , (after the registration process of course), you can claim your tokens but beware of the EXCESSIVE Gas fees.

*Pre-requisite : 'Register' (cost: 0.0010086 Ether/ gas limit: 90000/ gas used: 24600) : SUCCESS

2a- 'Claimall' First failed attempt (cost not sufficient : 0.00369 Ether/ gas limit: 90000/ gas used: 90000) : FAILED
claimall is the same as applying claim for each period (from 1 to 350 by June 1st, refer to this link to know about the periods https://eos.io/schedule.html )

2b- 'Claim' for 1 specific day :

*****************1st Attempt(cost: 0.002716373 Ether/ gas limit: 66253/ gas used: 66253) : SUCCESS

*****************2nd Attempt(cost: 0.002716373 Ether/ gas limit: 66253/ gas used: 66253): FAILURE (confusing results)

*****************3rd Attempt(cost: 0.002718997 Ether/gas limit: 90000/gas used: 66317): SUCCESS

*****************4th Attempt(cost: 0.000943082 Ether/gas limit: 90000/gas used: 23002): SUCCESS

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Notes:

*Claimall cost a lot more than 90000 and need a much higher amount (Please give your feedback about your experience with 'claimall')
*You can claim 1 period at a time if you know exactly when you bought your EOS tokens (from EOS, not from exchange, if from exchange you can't really know), starting from the period +1 (E.g: bought/registered @ period 100, claim after period 101 ends, and only begin by period 101, 100 won't work), this will help you reduce your gas fees drastically. if you have bought them for few days instead of paying for each period query.
*Gas fees seem to vary a lot from a minute to another for the same transaction
*On the above examples gas fee 41Gwei, but this can fluctuate between (1Gwei and 50+). A good article if you want to learn more about the gas price and how it is calculated. https://steemit.com/ethereum/@maa/effect-of-etherium-price-on-etherium-gas-fee
*Metamask seems to auto-calculate the transaction fees to avoid running out of gas during the transaction (if out of gas, transaction fails and gas fees used are lost)

Hopefully this will help save a lot of money for people who have been struggling with EOS.

Please upvote & comment with your experience: