I just got an overdrive and am trying it out. I did look at Clear, and they have an interesting product offering.
I didn't like the Clear Spot + USB WiMax modem setup tho. A friend of mine has it and it becomes two devices to carry around. The Spot sells for $139 IIRC. I think the Clear Spot battery life would be better than the Overdrive tho, just looking at volume of the comparative LION batteries - the Overdrive is about one third to one quarter the size of the Spot, especially when you add the USB WiMax dongle.
To be clear, the 5 GB cap is for the 3G service of the Overdrive - the 4G service is unlimited. I did like the idea of having the "fallback" to 3G on the Overdrive - 5 GB should be enough for a mobile weekend or so once a month in an emergency. I didn't see that Clear offered anything like that - perhaps someone knows if they do?
There are some interesting selling points of the Overdrive. It has a GPS receiver built in... and it is not a based on cell towers at all from what I can tell. It picks up the satellites and gives you latitude/longitude/altitude readouts. It can be turned on or off as needed. There is a micro SD slot on it that can be used to store files... like a NAS. It can be directly hooked to a USB port if you don't want to use WiFi for access, or don't need to share the connection.
Speed wise, it is pretty darn quick in my area. I did some testing and it gets 2.5 to 3mb/s down and 500 to 1.3 up with about 50 to 200ms of latency. It gets much better the more towers it sees. I haven't tested it in downtown yet.
For me, the Overdrive seems like a good fit. It was $49.99 at Best Buy... I am a rewards zone customer so I burned a $45 certificate and called it a day. I think if you do the math, you get $10 back in certificates if you buy the low end iPad ($500). If you're smart and patient, you can get the Overdrive device for free using the rewards program.
I have used AT&T's 3G network in my area with the iPhone a significant amount and have been somewhat frustrated. I do like the special pricing deal that AT&T has for the iPad, but it is just for the iPad. It does nothing for my MacBook and other wireless devices. Unless AT&T starts allowing tethering for 3G devices, the iPad pricing seems like a hollow concession.
Plus, consider that with the Overdrive and an iPad 3G, you have the option to access WiFi, 4G (Clear), 3G Sprint and 3G AT&T. It seems to give you the most options in my opinion.
If you're in a 4G enabled market, the
Clear 4G service is only $40/month and no contract necessary. They have a similar setup that you plug their 4G USB modem into a little wifi router they call the "Clear Spot". Their service is actually unlimited too, no 5GB caps. The USB modem can also be plugged into your Mac directly if you want.
I'm debating waiting for a 3G iPad or getting a WiFi one and Clear 4G. I just wonder if carrying around the extra device would be cumbersome.