I have the 522C which is the later version of the 334C. It hasn't failed me yet, though I run it on a tiller boat. I spoke with a Lowrance rep this past Saturday @ the sport show and asked him specifically if Lowrance will still support(service) the LMS series which include the 334 and my 522 unit(s) and he said yes for another 4-5 years. So Lowrance will repair and service as well as update the software. His words, not mine. Great unit!