Good but not perfect.

Pros: works as advertised. Allows to save money with local sim cards without losing phone number. Interesting concept, and a lot of effort has been put to make app user friendly.
Cons: 50% of the reason of keeping your number is calls, the other 50% is text. Texts dont work, even though Roamer say that is not their fault, its still a limitation. There must be a way. Maybe the key is not in text forwarding directly to the phone but rerouting? Text goes to you, and then you resend it to new phone number?
Another big problem is it Requires data connection to make a call through the service. What if the local SIM card bought doesnt have a data connection and theres no wifi available?
Finally Wifi call rates are too high. Tons of programs exist using wifi calls and theyre FREE. I understand and accept the charges when using network, but I shouldnt have to pay when using Roamer through wifi (and I dont. I just switch to another free app). You want me to use your app and include into my daily routine as much as possible. Therefore, remove the wifi calling fees, and you spread your brand that way.

Maltop about Roamer-Goodbye Roaming &Cheap international calls, v4.3.6