I have used GNS3 all year going through the workbooks. I have found it annoying and are now looking to move to VIRL. While I have used GNS3 for years now, what I have generally found is that GNS3 has quirks, and it can knock your confidence. Lets say, for example, you have an issue, and you think to yourself 'this should work, I have done this before and its been fine', then inevitably you start to doubt yourself, and your knowledge, and you recollection of what you did and how it works. You work on it, for a while and after exhausting all avenues of troublesooting decide to reload all routers (which you cant actually do in GNS3 - you have to shut them down and restart them, therefore losing your configs), only to find when they come back up again it works fine. I have had this happen a number of times now - thankfully I am at the point where I know my stuff well enough to understand whats a GNS3 quirk or a hole in my knowledge.

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Im not hating on GNS3 - never will, but if I had the money I would be building a good server and build CSR1000v platform to use - its as real as you can get. I have used the rack rentals, but avoid that where I can - to save money and because I actually think accessing the rack rentals is cumbersome and time consuming in itself. There are good points and bad for every option.