In my experience, it's a hit or miss with the bacterial products. Some people swear by them. I've only had my tanks for several months but of the products that I have tried (API stress-zyme, nutrafin cycle, microbelift special blend and Nite-out, biozyme) I felt biozyme maybe helped a little. My 20gal still took a good 8weeks to cycle (made a few mistakes along the way).
Best thing by far is some gravel or filter media from established tank but since you don't have that you could try some bacterial product (they're not that expensive, you can get away with the smaller bottles for your 150L). Whichever one you use make sure you get the newest one you can find, if the product is old the bacteria in it is probably dead (this is why I think these products are hit or miss). Biozyme is a solid and has no expiration (my guess is that it is lyophilized bacteria, but am not sure).
Another thing to have in mind is some of these products with live bacteria, like Nite-out, will say to keep refrigerated and yet the pet stores I've seen do not, that makes me seriously doubt whether there are any live bacteria in there by the time you buy it.
These are just my thoughts and experience on this, doesn't meant I am right, but hope it helps =)