I have had or have almost every tape deck discussed in this thread. I currently own over 25 and have probably had 100 of them come and go over the years. In my opinion Pioneer 909 is beautiful eye candy but it has a part that when it goes is unobtanium and then they are a parts machine. Eventually everyone of them is doomed to fail. Akai M8 is an old tube deck, own 3 of them but I wouldn't recommend them other than as a curiosity same with the Akai 1710. Teac 4020 and all of it's subsets, a good deck in it's day but dated like all decks without locking spindles. Uses the old Akai style of having the transport and electronics separate. Otari MX5050, I have one that is 4 track and has been modded to 3 3\4, 7 1\2 & 15 IPS. A solid pro workhorse machine but requires a special balance input\output to RCA adapter as normal one don't work, I built my own. Probably one the last 5 decks I would get rid of. Teac 23\3300 series, any of them. I currently own four of them and the 2300 and one 3300 would also be on my list of my last 5 decks to get rid of. Revox of any flavor is a solid deck, but rather pricey for what you get. Akai GX-620, I have never had one but currently have GX-625 which has the same transport. It has a solid transport mechanism but flakey output transistors. I am going to sell my working GX-747 to fund the repair of my GX-625 and other projects. Pioneer 1020 have it and a 707 that need repairs but both still play.The 1020 will be the keeper to be repaired. Sony, I have one left out the over 15 I have had over the years, it is three head but one motor. The one motor ones are easier to repair. I have had one Tandberg and it was not reliable IMHO. These are just my opinions, YMMV.