TOTW has many things going for it. I haven’t used it that much but what I have seen I like a lot.
The mechanics are simple enough, with rules for trains, armoured cars, mechanical failure, low or poor ammunition etc.
It is not a skirmish set, although it will cater for any number of figures, but basically they have to be in some kind of formation be it a platoon, company etc. It is ideal for 15mm in my opinion since I wanted there to be scope for larger actions on the table. The rules emphasize the importance of willpower amongst your troops. Small numbers of highly motivated troops will outperform hordes of disinterested conscripts.
There is something about the number of figures reflecting the will of the unit rather than physical strength of numbers. However I haven't paid much attention to that since my 15mm figs are based on stands reflecting their relative formations e.g. light cavalry 2 per base, skirmishing infantry 2 per base, rank and file in 3s. I like the idea that you can’t tell a units strengths (or weaknesses) simply by looking at it.
There is a card based action sequence, not an alternating turn sequence so you can’t necessarily choose what happens or what you use next which makes for some interesting situations and simulates the chaos of battle rather nicely. Better quality troops get extra 'action' options and the quality of officers and 'persuaders' like Cheka etc. are catered for.
There’s also a simple hidden movement/deployment system akin to Principles of War with 'blinds' that need to be spotted for to find out what they are, ideal for BoB in my opinion. Great to send your cavalry outriders to investigate a dust cloud only to find it’s a camel caravan while your main body gets attacked by something else!
Well worth a punt if you want to try something a bit different.