Vox is a great little device.
Stable, full of options and now a step before seeing its cooked roms (let's hope).
On the other hand... I don't know your wife and please don't take it badly but, does she really need one?
I mean, except for the fact to handle Thai and English at the same time and popular software... I guess many other Smartphones would do the job.
I say that because a MS Smartphone is always trying to be more "Smart" than "Phone", while a N73 or any other NSeries (for example) will always be more "Phone" than "Smart" even tough they could have the same capabilities.
I'm pretty happy with my Vox. It's pretty slow compared to my previous Excalibur with WM6 but still... It's a good phone. Maybe an update will fix the slowness, nothing explains why an Excalibur with same CPU is faster so a solution must be there.
Would I recommend it to somebody just looking for a Smartphone... Well... If this person is really looking for a phone with keyboard, then yes, otherwise... A N80 from Ebay is ways cheaper and would do the job. Loads of software, easy to handle... Etc...
Why do I say this? Well, guess who bought a Wizard to his wife and sees the only thing she enjoys is the keyboard to send mails and SMS... My fault, it's not a toy for her...