RB751U is more expensive, larger and has more output power.
RB951-2n is smaller, less expensive and has less output power.
TL-WR841N has 2x2mimo, 2,5dBm detachable antenna (RP-SMA) and 17dBm radio. Shop price is around or below 20$.
RB951-2n is 1x1 (!) siso, 1,3dBm internal antenna (so less receive sensitivity). Shop price in EU not seen yet, but has to be much lower than $ 20!
To stand a change in any sales the RB951-2n has to be half the price as the TP-link or it will simply submerge in the Tsunami of TP-Links flooding the shops on every corner of the street.
MT has a name in routerboards and makes marvelous products in the medium (wireless-)networking segments. But if they want to aim at the lower end of the market they'd better make even cheaper stuff or, come up with devices the competition doesn't have (yet).
Like:
- Poe output (on the cheap models!
- Better/higher antenna gain. (It's not all about sheer output power. The client is still sending with low power.)
- 2x2 mimo or better, start building 3x3 mimo. The competition already has these in their product lines... And make sure both V+H pol are around. Modern devices like mobiles and tablets are not static so basically the AP needs to cover the whole polarization spectrum. Even if that device is only a 1x1.
- Dual radio in the small Home/Soho Box. Steer dual radio devices (a/b/g/n) away from 2,4ghz to 5Ghz band.
Find a way to simply avoid interferences by swapping channels towards more quiet ones in split seconds while running. (So not only at start-up). I've seen it working with other vendor and it works like a charm. You need some intelligence in the OS and CPU power, just what MT already has!
With the capacity of MT-OS and CPU power available MT should, and can, make wireless technology development as a focus for future product. Trying to beat a player like TP-Link in price is a lost battle...
I love MT but to find myself in a position to still buy them in the future they really need to boost up their innovations.
MT really needs someone that looks at the market developments on a world scale. Mobile users are the bulk users of the Wifi of tomorrow. Providers will have to work with more and more crowded spectrum and competition. The only way to stay present is such a market is to be intelligent. Invent products for the wifi of tomorrow. Don't come up products that we needed yesterday....
If you need a strategic 'hand on board' you'll guys know my e-mail!

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Rudy R. Puister
WISP operator based on MT routerboard & ROS.