Flexarets are good camera's but you need to have one that is serviced recently, Cupog on Ebay is a guy who sell serviced ones and he is trustworthy. The lenses are great and you can even have close-up lenses that will allow you to focus from 33cm and up (without these the minimum focus distance is 1meter). Be sure to take one with a Belar lens, these are the Tessar type lenses because the Mirar lenses are only triplets (Mirar lenses were phased out when the Flexaret IV was introduced). There are also some details to consider, the older models (from Flexaret II till IV) you have to cock the shutter manually while the newer models (Flexaret V till VII and the Standard) are automatically cocked when you wind the film. This automatic winding works great but you cannot do double exposure with them (except with the VII, which has a lever to do Double Exposure). Also, from Flexaret II till V they used the 30mm push on filters while the VI, VII and the Standard use Meopta dedicated bayonet filters which are a little harder to score (although they pop up on the bay from time to time). They also come in a variety of shutters, later models have Metax shutters who will go up to 1/400 of a second while the VII has a Pentacon Prestor shutter that goes up to 1/500 of a second. The IV and V's are installed with various setups, mostly Prontor shutters. Mind that the Flexaret II has been sold next to the newer models as a budget model (it lacks a frame counter) and might be even installed with a Metax shutter.
I used a Flexaret IV and VI for a few years with much pleasure, the way of focusing might be a little awkward at first but you get used to it pretty fast. And they are cheap, even a serviced one will not break your bank. They are certainly worth the try if you are new to MF since they are cheap but like I said before, be sure you get a serviced one because many have been left in closets for over 3 decades and are gummed up.