I have a large IJA collection for the Burma theatre, comprising of miniatures from a number of companies. These are mostly TAG, Warlord metals (and a few plastics), Brigade Games, and Westwind.
They all have their good points, and given a unifying painting and basing style they work well together.
The LMG team above is a TAG figure on the left, Warlord Jungle Fighter on the right.
The Warlord Jungle Fighters are among the best of them, due to their posing, detail (they need careful cleaning up), and their choice of heads. Their plastics are useful and versatile too; I made a sampan crew using them, and this guy with a pole charge was easy to modify with some epoxy putty.
TAG are probably the easiest to paint, and I like their weapon teams. They aren't cast with the puttee ties, though this is no big deal even in 28mm.
The Hicksian Brigade Games figures are very nice, smoothly-sculpted with great faces, and they do some wonderful ragged Japanese (which I mix in with with my Warlord Bamboo Spearmen as last-ditch defenders). However, the BG miniatures sometimes have delicate bayonets, the more vulnerable and fragile of which I replaced with lengths of pins.
I had to do the same with all the Westwind infantry, which as cast looked like they were using boxcutter knives for bayonets. These are the earliest of the 28mm Japanese ranges, and they needed a lot of work. Some of their heads were dreadful, so I chopped these off and replaced them with separate Jungle Fighter heads sold as extras by Warlord, which improved them no end.
I like how they have turned out, but had I known the extra work involved I probably wouldn't have bothered. However, the Westwind LMG teams are superb- really look the part, and although I haven't finished them yet they are proving straightforward to paint.