Banelings are too much of a power unit when both players are going speedlings to make this build too viable. Dumping 100 gas on +1 instead of 4 extra banes isn't something I believe will help you out at all.
How have you found the build goes vs banelings with decent control?
Time for me to be brutally honest.
I dont know.
I've tried this build a few times, and its won most times, especially when my opponent doesn't go for tech, and makes a large ground army. But I dont know how banelings will really effect the build. In a wide open map, you can assume that speedlings will outrun the banelings, but the player with the banes should be able to control them well enough to defend their bases. I doubt it'd be possible to lock down expansions, but it still gives you the cover to expand yourself. Also, since I recommend a few spines, defending vs banes can be easier.
I've also tried this in 2v2s and its worked even better, as you dont need spines.
But the build order above isn't even the most efficient order. Im going to modify it now so that there is no excess gas mined and so that its safer vs rushes/proxies. I think the build is also good vs some protoss openings, I've heard of a +1 speedlings expand build vs protoss, and this was just what I came up with after hearing about a build like that.
The build isn't foolproof, but which build is? It has strengths and weaknesses like any other build, you just need to assess whether you have a good amount of control using this build compared with other builds you can use.
Edit: I also believe the early +1 vs a zerg can always be a benefit. Even if you switch to roaches or banelings, you will be ahead in most battles due to that upgrade. Afterwards I usually get the +1 armor, which really screws them over.
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