While there are some issues I would flag up around the Lumia 610, such as having a single core 800 Mhz processor; 256 Mb of RAM; and only 8 Gb of storage, it's still a handset that can get the job done assuming you're not looking for a handset that is going to be chock full of applications.
By the way, Jayesh Limay has some thoughts on Windows Phone 7.5 vs Windows Phone 8 which might make a good footnote here.
We looked at the Lumia 610 last summer, and found a great little handset within its own limitations:
I think that whilst the Lumia 610 is not going to break any speed records it’s a great value handset that’s packed with features, giving you access to both the Windows Phone ecosystem and the excellent Nokia exclusive apps (e.g. Nokia Drive and Nokia Music). I doubt very much if any handset in this category can offer up a similar level of features out of the box. That makes the Lumia 610 well worth considering for those looking for a smartphone on a budget.
Now that budget is even more wallet friendly. What do you make of the Lumia 610 on pay as you go?