It really depends on the type of consumer you are. I bought the Soundwave, it's actually one of the best ones (IMO) and if you're just going to build it once, convert it once I'd buy it. These guys are all roughly the same size of a voyager class figure.
If you're like me you have to be careful, the C-clips aren't as durable as I thought. Lego has been at this a lot longer than Hasbro, I am hoping that they'll learn from this because I'd like to see them using construct bots with it's other brands e.g. GI Joe or ressurect brands e.g. Centurions