Although the Go Plus is listed here as a pre-order, many trainers have purchased this item from other retailers. I had very high expectations and when I first got my Go Plus, it was great -- the best -- no complaints. Mons would pop up when I was driving on the freeway and I got every single item from every pokestop that came up. I understand that this game was made for walking/running, but in reality, its winter in most places now -- cold, wet, windy, raining or snowing. Not ideal for you, an electronic device, or your phone for that matter.
Fast forward to today. My trainer level is getting higher (thank you Halloween Event) and the CP of the mons are getting higher. With the higher CP, the lower your chances of catching pokemon with a single Red Ball. You only have 1 chance -- 1 throw with 1 red ball. No option to use a Razz Berry, no option to use your Great or Ultra Balls. Essentially your catch rate will suffer and you'll find that you missed your chance to get that mon that you wanted. Kiss that Ditto goodbye. *side note, you will also not receive the extra curve, nice, great or excellent bonuses either.
Niantic has also imposed safety thresholds on the pokemon and pokestops. The last I checked, being a passenger in a vehicle traveling over 25+ mph will yield your go plus useless. You'll get a 'Try Again Later' for the stops and the pokemon won't even bother showing up in your nearby. The only sliver of hope will be when the vehicle you're in slows down and makes a stop.
Another pit of the go plus? If I'm connected to my phone too long, it won't see the pokemon or pokestops. I have to disconnect and reconnect to get it working again. This is probably a problem with the game itself where it sees you as being a robot or spoofer and you have to restart or captcha to get it working again.
So do I regret buying the go plus? Is it worth it? Yes and no. If you don't mind disconnecting and reconnecting every now and then, and don't mind a low catch rate or missing pokestops, then by all means, best purchase everrrrrr! Just know that its not all that its hyped up to be and have realistic expectations...
Oh! Also have a spare battery with you. If you go hard and grind, you'll need it.
Sorry, this is such a negative nancy review, but in reading the other review posted here, I thought it was a bit misleading and written by some marketer for the product.