Personally I wouldn't recomend them. I used Kushies with my first dd and with my son and they weren't good quality diapers. They were 'ok' but personally I think it's worth the extra money for a better diaper (like the Toddle-Ease in your case). They're flannel as opposed to terry, which isn't the most absorbant or durable fabric. I found the vinyl layer to be all but useless in terms of acting as a cover (which they say it does for all but heavy wetters - not true). All it does it make the diaper that much less breathable... The velcro on mine (all of them) would come undone in the wash every single time so they'd all stick together and I'd have this long diaper 'snake' in the washer every time I washed. The elastic wasn't the greatest either, making blowouts more common (although at your son's age that may not be as much of an issue if he has nicely 'formed' bms).
Like I said, they're 'ok' if you get them for free or maybe as 'spare' diapers that you only use as backups or something like that. But honestly I think it's worth the extra money to invest in quality diapers. You can always buy used to save a few bucks. Better diapers will also have a higher resale value so that's something to consider as well. Oh and something else to consider is that he may fit in the one-size longer than you think (at that age they don't tend to grown 'bigger' very fast, it's mostly height they gain). At the very least they could last until he's daytime trained and then you'd only need a handful of bigger diapers later on for nighttime.
That said, some people do like them so it's all a personal decision, perhaps for you they'll work fine and you'll be happy you saved that money. Try the one you have for as long as possible and see what you think, that's what matters most. You can also see other reviews at diaperpin.com