I would rather have a CAT or a McMillian, but you can't beat the TK-4L for size and price. These are cheap and compact enough to keep in just about any kit.
Same here. I have CATs and SOFTT-Wides in my dedicated kits but the TK4 is hard to beat for ultra compactness. I have some trouble applying a SWAT-T with one hand, and I suspect it would be tougher with blood on everything. I find the TK4 to be easier to apply one handed.