iSpionage is a search engine marketing solution built specifically for PPC marketers. It is built around features such as competitor research and campaign monitoring.
iSpionage is ideal for when you want to get a feel for the competitor landscape for a potential client. You can just pop in, throw in the URL, and see which competitors populate, then look at the average spend. I wish I could look back at like yearly average spend, easier (default on last 1 month). But it's great to get quick glimpses and build some quick talking points around that. I don't think it's all that good for organic keyword analysis. I find the organic interface a bit clunky, with lots of information that I don't feel is all that relevant. Stick with paid search insights.
KeywordSpy is appropriate for most Internet Market research companies. I would not suggest it for a corporate marketing department unless it's a company with a very larger budget. This is also not a tool for small freelancers even though there is a free option, to get the best benefit of KeywordSpy it's best to use most of its features and options and this can get pricey.
iSpionage is nowhere near Semrush (and to a lesser extent SpyFu) in terms of usefulness for competitive intelligence, keyword research, or strategic planning. It has nowhere near the depth of data or level of tools available in other tools.
Most SEO and market research tools offer what KeywordSpy has but are not as detailed and in one place. Consequently, where you can do everything at KeywordSpy, with other tools you find you have to purchase multiple tools or subscriptions from different providers which also don't integrate with each other. KeywordSpy makes your research easier and more efficient.
