My 3 last phones have been MTK. The price/performance is much better in my opinion than most of the alternatives. Of course I won't get top range phones, but I'd rather get a new MTK based phone on a more rapid update schedule, and recently there's been some very high quality phones coming out (e.g. aluminium casing, gorilla glass and very high quality full hd displays) using MTK chips.

My one caveat with them have been the dreaded weak GPS, but I don't need GPS much, and with my last phone that works fine too anyway (but anyone considering MTK based phones: if you need GPS, read reviews; on some it works fine, on others it requires some light modding, and on some it's practically impossible to get the GPS working without sacrifices to elder gods and lots of swearing).