Re: testing 1 2 3
If you have 365 at home, that means you have hard apps, and hard apps can save and open from your local drives just like always.
If you choose to store all your stuff in One Drive, that can certainly add some lag. This is particularly true if they are large files. Hopefully you aren't storing things in OneDrive "just because", but instead for a valid reason which justifies the occasional lag of using any WAN solution.
I can't speak to your experiences with needing to repair unfortunately.
What I will say however is that the one-time(isn) CAPEX vs ongoing OPEX question is becoming bigger every day. That is particularly true now that MS has made using anything other than proper OpenLicense Office very painful for all but the smallest SMB.
It makes a lot of sense to go O365Biz when the decision is 15$ (now 12.50$) a month / 180$ (now 150$) a year per employee (which includes hosted exchange, share point, OneDriveBiz, Etc) when the alternative is 466$ per employee up front + server software + cals, etc.
Of course the funny (in the most sad and traumatic of ways) part to all of this is after you get all the open licenses purchased, server software deployed, CAL's loaded, etc - Someone from sales is going to call you for support because they just signed up for 15 seats of office 365 as they absolutely needed powerpoint on their iPads and now they want to figure out how to pull files from the central server. Oh - and while your here - the CEO was down yesterday receiving a presentation, saw powerpoint on the iPad and now wants to talk about getting this to everyone middle management and above.