TGM's tips are based on his experience from his day job - escorting guests around WDW. He's in the parks virtually every day and constantly revises his tips based on what he sees. The bulk of the site is effectively an online guidebook which you organise to suit your own needs. Each and every time Disney makes an announcement of any kind, you will be notiified via your AVP (Automated Vacation Planner). That could be anything from park hours to new attractions to hotel discounts. Likewise, you will receive a notification each time Mike updates any of the articles on the site. There are also lively Discussion Forums.
I've been subscribing for several years and will continue to do so for the "Least Crowded Parks" information alone. This is much more detailed than anything else out there. For each day of the year (split between mornings and evenings), TGM will analyse the likely crowd levels at each park and provide his reasoning. If Disney changes something which is likely to impact that advice, he updates it. He also provides touring strategies - not so important for us because we no longer feel the need to experience all the attractions, but sound advice if that is your priority. I've certainly picked up one or two nuggets of information.
Other useful stuff includes where to stand for the parades and fireworks, the best showings to attend and on which days, information about checking in (and out) of hotels and detailed articles on all attractions, resorts, restaurants, transportation, activities, etc. I particularly like the fact that Mike always explains the reasoning behind everything.
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