Ive never had the chance to try ntbm's bulk powder but I'm sure it's great stuff - I've been turned off of weight gainers in general cause the ingredients are generally poor quality - just get yourself some good whey & throw in a banana/oats/Greek yogurt/natty PB.
After being on n2slin I would definitely Use it on a bulk to minimize how much body fat you put on..
I would also take some creatine, bcaas, fish oil, b12 (supposedly good for energy/appetite), CLA, and a multi.
I'd just make it clean bulk though cause there really isn't any point in throwing on too much bf then needing to cut up for a while.