So far nothing but that can be attributed to the fact that even after switching to Linux I still use mostly closed-source proprietary software on it. Before you roast me for this let me give you the reason I like Linux because of its functionality and customisability Im no open-source warrior. On Windows I used to use FL Studio Pro sadly it wasn available for Pop OS (or any Linux) so after a brief search I found out something insanely superior to it called Harrison Mixbus 32C. Mark my word if youreing to Mixbus 32C from FL Studio Pro you would be literally blown away by its abilities. It aplete monster of a DAW and the best thing about it is that it has essentially addressed my biggest gripe with DAW i.e. the sound most DAWs guitar bass and drums just sound tinny. But on Mixbus 32C you get that massive analogue sound. Of course it took me some time to get used to but once I got used to it there was no turning back. Of course its cost was high but damn it an excellent DAW. Then it was Adobe Premier Pro again it not available for Linux but then I found an excellent alternative to it called DaVinci Resolve Studio and I really got more than what I bargained for on it. A one time payment of $299 is pretty reasonable. Then it was about Microsoft Office the default office suite called LibreOffice is good but it has numerouspatibility issues with MS Office files so after a brief search I went for Softmaker Office and damn it just offers perfectpatibility with Microsoft Office. Basically I was a user of MS Office Home & Student so Softmaker Office clearly covered my needs. Of course it was a paid software. I never felt the need of Outlook on Pop OS the Evolution Mail covered that need of mine. Then it was the need of a good Calendar software Gnome Calendar app is just isn good enough so I replaced it with MineTime and my problems were solved. Then it was about Google Drive after a brief search I found the client called overGrive and my problem was solved. Of course it a paid software. Mega Cloud has its app for Linux too. As an alternative to Microsoft OneNote I went for NixNote 2 and Evernote and they solved my problem. For PDF editing I went for Master PDF Editor. Yet again a closed-sourcemercial app. For LaTeX editing I went for TexStudio. On Windows I used to use WinEdt. As a Notepad++ alternative I switched to GNOME Builder. As an alternative to IDM I just use XDM which has all the same feature and has same speed of course it has a better UI than IDM. The UI of IDM is archaic. As for an alternative to Finale I had to yet again use a paid proprietary app called Harmony Assistant. IBM SPSS is available for Linux too so in that area it was nothing different for me. I used to use HTTrack on Windows on Pop OS I use HTTRaQt there barely any difference in that segment. VLC media player is available for Linux oo. Now about podcast software well I used to use gPodder on Windows and it also available for Linux so no difference there. It syncs perfectly with Video Podcatcher Deluxe on my phone. For eBooks I used to use FBReader on my Windows PC and I use it on my new PC running on Pop OS so difference their either. I used to use PuTTY on Windows well on Linux you don need that Inetutils Mosh Netcatbined with the default Gnome Terminal is way more powerful than PuTTY. So overall I don miss anything about Windows I just knew about the right tools which made the switch pretty easy. As of usage on laptops I canment on it. I use Linux on my desktop but from what Ive observer Linux based distros can often be hit and miss on laptops. Pop OS and Ubuntu both work excellently on my friend new Dell XPS 13 937 trackpad responds buttery smooth battery life is same as the Windows variant but it may be because of the fact XPS 13 is a part of Dell project Sputnik so it is officially built for Linuxpatibility. Same can be said about other laptops as in most other laptops except T-series ThinkPads the battery life is horrible on Linux distros. So unless you shell out a heavy amount of money to buy a Linuxpatible laptop running Linux on laptop is a bad idea.