If you really want to sync between multiple computers, it is technically possible. You have to place your iTunes library folder in a location that can be accessed by all of the systems on the network. Then, when you want to access that shared library, hold down the Option key (Shift key on Windows) while iTunes is opening. This will bring up a dialog box with an option to select another library. Click it, and browse to the shared network folder with the iTunes library in it. iTunes will open with this library, and you should be able to sync your device on that computer.
The downside? Unless you have a server or network attached storage device, the computer that is actually hosting the iTunes library folder has to be running more or less all the time. Also, iTunes may not maintain all of its purchase authorizations between computers. If these things don't bother you, then this is definitely an option.
I stumbled on this question because I'm having problems with poor wifi speeds after installing Yosemite on a July 2014 rMBP. I don't get drops, but I get 5 Mbps speeds literally 5 feet from the router when I used to get in the 70s. My iphone 5S, sitting next to the rMBP, is able to get 70Mbps. Even more confounding is that if I change the router to support only 802.11g, the speeds are at 54Mbps.
What I learned is that "MCS Index" value is significant--it communicates from the Access Point to the clients what coding schemes are in use. There is a standard table defined by 802.11n, and you can view it here: http://en.wikipedia.org/wiki/IEEE_802.11n-2009
In your case--and in mine--an MCS Index value of zero shows up. According to the table at the link above, that means the maximum rate available should be 6.5-7.5 Mbps. However, in your output, it claims you're getting 54Mbps, which seems wrong.
So, why am I answering? Because in both cases, the evidence suggests that Apple's driver or the chipset is doing the wrong thing with the MCS Index value. In my case, I sniffed wireless lan traffic and confirmed using wireshark that the AP is announcing itself with an MCS Index value of "7" (conforming to what I actually set in the configuration for the AP). Yet, my rMBP insists that it's a zero and sets the speed accordingly. In your case, it appears to be recognizing the MCS Index value as zero but setting the speed incorrectly.
In short, I'm not sure that reinstalling your will actually change anything for you.
Best Answer
Apple's official website has a compare section for Macs where you can compare between three different models of Mac simultaneously. You can access it by going to the following link:
When making a purchase decision, the first distinction that you have to make is whether you are looking to buy a desktop or a laptop.
Broadly speaking, Apple currently makes three kind of laptops:
MacBook Air - A 13" ultra-portable.
13" MacBook Pro - A lightweight laptop for professionals.
16" MacBook Pro - A spec heavy laptop geared towards users needing extreme performance.
and three kinds of desktops:
Mac mini - A bare bones lunch-box size computer sans display, keyboard and mouse.
iMac - A fully integrated desktop computer.
Mac Pro - An expandable desktop tower for users requiring extreme performance.
Once you have filtered down to the determine computers that you are looking to choose from, head over to the Mac - Compare Models web-page and select the desired ones. You can compare upto three different computers at a time.
Here's a comparison between a 16" MacBook Pro, a 13" MacBook Pro and a 21.5" iMac looks like: