About the only advantage to it is that it runs silent.
Other than that, I wouldn't touch one, when a new Rigol or similar can be had for the same price or less.
For some reason the TDS210/220 still commands a decent price on ebay. Probably the Tek fanboys.
A great market changing scope in it's day, but it's poor screen, update speed, and memory means it can barely hold up today.
IMO, they are probably worth about $200-$300 tops.
Dave.