Are you saying if using Electrum desktop software, which I expect to be available/online (for usage, not only to download) all the time 24/7, I wouldn't need to synchronize the blocks all the time? How it would capture the transactions then? You said I could try to switch from bitcoin-qt to Electrum (i chose it from your 3 suggestions). Now, since funds have been sent to ewallet (still not received), it is probably too late to try Electrum. I doubt I would have same ewallet id and due to obvious reasons I cannot define one.  So since funds have been already sent by me to my ewallet id, those funds would never arrive to Electrum because of different ewallet id and could be some other reason too. Im aware you told me I can export/import but im not so sure importing to Electrum ewallet.dat would enable me owning exactly the same ewallet ID. Im afraid doing this could lose my btc amount that hasn't arrived yet but the good thing is that I believe even if trying exporting/importing, IF something goes wrong, I could basically just resume with synchronization in bitcoin-qt.

It has passed almost 40 hours since I started synchronization procedure and so far very tiny progress. Im sure electricity utility bill will cost me more than the actual amount of btc arrived. The updating of blocks isn't going anywhere, almost frozen.

In bitcoin-qt isn't even exporting option but ewallet.dat can be easily accessed via Documents and Settings\User\Application data

However on the following link:

https://electrum.org/

I don't see Import option anywhere. How come? Plus according to their website i just provided, transactions aren't irreversibile (no refunds/chargebacks) anymore. See image on that website.

Also are there any other disadvantages in electrum?