I have two Tek's.... Both have served me well... The reason is that I mainly do digital electronics and so ANY DSO will point you in the right direction.... I really only need a logic analyzer.... But my old 2210 has enough storage to do most of what I need...
I only ever had scruffy scopes before that... Telequipemt D1011 was my first... £50 out of he back door of Uni... Still works beautifully ( apart from cleaning the switches with electrical cleaner every time I turn it on ) .
I can't give a real definition on DSO's but I find that it all depends on what its needed for... I bought a cheap hand held from China ( DSO0201 ).. It looks like a phone, but it does enough for what is required... That's all that matters..