Yes, I'm curious as the negative aspects of FV. Once such concern I had was data corruption and recovery. But having gone through a couple drive failures, including a recent SSD failure, since I synchronize my data with my desktop, I always have a good data source to do a complete install from.
As anyone should have surmised, I presently have not used FV on any of my Macs since the beginning of Apple, but only now am contemplating it just on my laptop in the very remote chance I may lose it (I've never lost a Mac due to negligence or theft). Its just that in recent years as SSDs have grown in size to the point where I've now started to have a complete copy of my entire desktop Mac's data on my laptop, I realized if such data was to be compromised, it would contain all my personal and financial data. So either I must completely trim down such data on my laptop to the bare essentials, or implement FV.