Better in every way!
I was in search of a router to replace my DIR-655 which had a radio failure recently. I purchased the E4200 and having been running some basic tests. I can say that so far I am quite pleased with the improvements over my DIR-655. My observations so far...
1.) Aesthetics. This router is very nicely designed. Internal antennas and sleek curving lines. Also, there are no retina burning status LED's like the DIR-655 had. The blue lights in the DIR-655 would illuminate the ceiling over my entertainment center and were quite distracting. The Cisco E4200 has a single status LED that is soft white and doesn't blink unless there is a problem with the router. The E4200 does have the typical LED indicators on each wired ethernet port, but these are not too bright are on the backside of the router and can be turned off if desired.
2.) Setup was a breeze. I still have a little more tweaking I might do but the configuration of the router is very straightforward if you have a little experience in this area. I did not try the Cisco Connect software and doubt I ever will unless it turns out that some features are only accessible through Cisco Connect. I can say that the Guest network feature does not require Cisco Connect to enable. I had heard that previous E series routers required Cisco Connect software to enable the Guest network. I'm not sure why Cisco would set such a low limit on Guest network connections (10). That is fine for me, but might be too limiting for certain applications. Also, I haven't poked around the config pages for a Cisco router since I replaced my old WRT-54. It's amazing how consistent these config pages have remained.
3.) Performance. It is still too early to tell for sure, but wireless performance seems to be significantly improved over my DIR-655. I say this on the basis that I have fewer disconnects and my range seems to have improved. I keep the router on top of my home entertainment center which is centrally located in my house. My biggest wireless challenge is getting a good signal out in my workshop (detached building) which is about 150ft away through two interior and two exterior walls. The walls are at an oblique angle which probably doesn't help the situation. With the DIR-655 I would register 1-2 bars and achieve a maximum link speed of 11Mb/s (often 5Mb/s or less). Worse, the connection would frequently drop and need to be reestablished. So far the connection with the E4200 has not failed. The E4200 connects with a stable link speed of 26Mb/s and it hasn't dropped once. All of this testing was done with the 2.4GHz radio. I have not tested the 5G radio and probably won't attemp it for this long range connection. Every other location in my house (large 2 story) registers 4-5 bars of signal strength and good connection speeds.
All in all, I am very pleasantly surprised at the improvements with the E4200. All routers are definately not equal and so far the E4200 looks like a winner. I'm not sure if I would have had the same positive results with the Netgear 3700 which was the other router I was considering. Perhaps the 3700 would have had similarly good performance, but you can't beat the aesthetics of the E4200.