|Experience with this or similar product?|
I have no experience with that particular device or any dual WAN SOHO routers like it.
What do you think?
I think if it's doing what you need it to do and you're happy with it, then you're doing the right thing and nothing else (and nobody elses, including my, opinion) matters.
Personally, having worked with many cisco devices over the years, I avoid cisco like the plague. They're no longer the only game in town. Yet they still treat customers like they think they are.
There are many, many other products from other companies out there that are as good as, if not better than, cisco products. The biggest difference is, other vendors don't overcharge for their products, their products are infinitely easier to work with, and they don't gouge you long-term on the support packages.
But again, this is me and my opinion. If you're happy with Cisco and their devices, by all means, have at it.
Any problems adding 25port switch to it too?
If it's a typical SOHO Router and has 4 LAN ports, you would simply connect the switch to a LAN port using a crossover cable. Yes, I'm fully aware that with moderm auto MDIX one can use a regular patch cable but whenever connecting like devices, I always use a crossover as it removes one possible thing to go wrong and should something go wrong, it's one less troubleshooting step you have to take.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.