I have used Finis SwimP3''s since generation 1.
I loved my first generation product (blue and white). No glitches at all. Songs loaded up very quickly and hassle free. Yes, it had limited capacity, but I was only swimming for an hour at a time, so didn''t really need that much space. When those finally died, Finis was on the second generation of the product (yellow and black). This one had firmware issues out of the gate and was not readable by a mac. When I got the new firmware onto the set, these too worked very well. Alas, these too died about three weeks ago. Which brings me to the Neptune System.
(1) Songs loaded up like a charm. Copied over mp3 files from my iTunes library and they played beautifully.
(2) Sounds better than the old SwimP3. If you are old enough and remember listening to music on an AM station and then listened to music on an FM station, that is the sound improvement you are looking at when you move from SwimP3s to Neptunes.
(1) Design. The ear pieces have clips that go from bottom up not from top down. Imagine using a clothes pin and pinching from above (SwimP3) vs pinching from below (Neptune). For me this is less sturdy than the top down approach.
(2) Design (2). The back of the head unit is bulky. It is a top down clip, but the back of the head unit is quite large especially if you wear a swim cap and wear the cap over your goggles. It''s only a centimeter thick, but that extra centimeter makes your cap just that much tighter.
(3) Song Display. Do you really need to see the song title and artist displayed while the song is playing? If you are like me, you''re swimming when the songs are playing and the unit is behind your head where you can''t even read what song is playing. In my case, its even below my swim cap so I really can''t see it.
(4) Reliability. This is the HUGE con. My Neptune is dead. My Neptune was delivered on 8/1. I didn''t start using it until 8/4. It wouldn''t play any songs this morning 8/12. In total, it lasted 6 workouts (11 miles). I don''t believe it is actually waterproof. I can see a water bubble under the screen. The pool I swim in is only 6 ft deep (max), so I couldn''t have exceeded the depth.
I am contacting Finis later today to discuss. Will update when that conversation is done.