Last April I purchased a 40V Ryobi self propelled single blade mower. It came with a 15" sting trimmer + two 6 amp batteries. $900 + HST at the time, probably cheaper now.
This was for the cottage, 12,000 sq ft of lawn, up and down hills, with the gas mower took 75 minutes.
On average each battery last about 35 minutes, depends on how long the grass is. Often I can complete the whole lawn without needing to recharge at all. It operates on one battery at a time, so one can be recharging while using the mower if needed.
The string trimmer works very well, much better than my Ryobi 4 stroke one.
I just purchased a 40V pole saw and a 40V 14" chainsaw. Haven't tried them out yet, but they get good reviews. I'll be using these a few times a year.
Overall, very happy with the 40V system, never liked dealing with mixing oil for trimmers or blowers + the starting hassles. The range of available accessories is great.
My gas mower still works, 20 years old. I use it in the spring and the fall to chop down brush in areas that I don't mow. This old Craftsman mower is indestructible, the Ryobi would never take the abuse, nor do I expect it to last 20 years. My wife reminds me that in 20 years I'll be 86 years old and its pretty likely I'll be cutting the lawn, maybe my grandson can pitch in.
My 29" Craftsman snowblower is 30+ years old. I'm looking at the various 40V Ryobi self propelled blowers. Some of them get pretty marginal reviews, maybe wait a few years until they sort a few things out. I'd like to be able to purchase a bare tool blower and haven't seen these yet. I'd be using the mower batteries. Never used the gas blower at all this past season so no real rush.